Extracting prog: 2m21.793600382s Minimizing prog: 12m15.230510674s Simplifying prog options: 0s Extracting C: 47.903428667s Simplifying C: 7m31.838720084s extracting reproducer from 1 programs testing a last program of every proc single: executing 1 programs separately with timeout 30s testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool detailed listing: executing program 0: r0 = socket$alg(0x26, 0x5, 0x0) bind$alg(r0, &(0x7f0000000100)={0x26, 'aead\x00', 0x0, 0x0, 'pcrypt(generic-gcm-aesni)\x00'}, 0x58) setsockopt$ALG_SET_KEY(r0, 0x117, 0x1, &(0x7f0000000340)="71e67a15cdf0311cfcf33a52a7d86bd1", 0x20) r1 = accept4$alg(r0, 0x0, 0x0, 0x0) syz_genetlink_get_family_id$ethtool(&(0x7f00000000c0), r1) program crashed: possible deadlock in padata_do_serial single: successfully extracted reproducer found reproducer with 5 syscalls minimizing guilty program testing program (duration=46.35547915s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg detailed listing: executing program 0: r0 = socket$alg(0x26, 0x5, 0x0) bind$alg(r0, &(0x7f0000000100)={0x26, 'aead\x00', 0x0, 0x0, 'pcrypt(generic-gcm-aesni)\x00'}, 0x58) setsockopt$ALG_SET_KEY(r0, 0x117, 0x1, &(0x7f0000000340)="71e67a15cdf0311cfcf33a52a7d86bd1", 0x20) accept4$alg(r0, 0x0, 0x0, 0x0) program did not crash testing program (duration=46.35547915s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-syz_genetlink_get_family_id$ethtool detailed listing: executing program 0: r0 = socket$alg(0x26, 0x5, 0x0) bind$alg(r0, &(0x7f0000000100)={0x26, 'aead\x00', 0x0, 0x0, 'pcrypt(generic-gcm-aesni)\x00'}, 0x58) setsockopt$ALG_SET_KEY(r0, 0x117, 0x1, &(0x7f0000000340)="71e67a15cdf0311cfcf33a52a7d86bd1", 0x20) syz_genetlink_get_family_id$ethtool(&(0x7f00000000c0), 0xffffffffffffffff) program did not crash testing program (duration=46.35547915s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-accept4$alg-syz_genetlink_get_family_id$ethtool detailed listing: executing program 0: r0 = socket$alg(0x26, 0x5, 0x0) bind$alg(r0, &(0x7f0000000100)={0x26, 'aead\x00', 0x0, 0x0, 'pcrypt(generic-gcm-aesni)\x00'}, 0x58) r1 = accept4$alg(r0, 0x0, 0x0, 0x0) syz_genetlink_get_family_id$ethtool(&(0x7f00000000c0), r1) program did not crash testing program (duration=46.35547915s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool detailed listing: executing program 0: r0 = socket$alg(0x26, 0x5, 0x0) setsockopt$ALG_SET_KEY(r0, 0x117, 0x1, &(0x7f0000000340)="71e67a15cdf0311cfcf33a52a7d86bd1", 0x20) r1 = accept4$alg(r0, 0x0, 0x0, 0x0) syz_genetlink_get_family_id$ethtool(&(0x7f00000000c0), r1) program did not crash testing program (duration=46.35547915s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool detailed listing: executing program 0: bind$alg(0xffffffffffffffff, &(0x7f0000000100)={0x26, 'aead\x00', 0x0, 0x0, 'pcrypt(generic-gcm-aesni)\x00'}, 0x58) setsockopt$ALG_SET_KEY(0xffffffffffffffff, 0x117, 0x1, &(0x7f0000000340)="71e67a15cdf0311cfcf33a52a7d86bd1", 0x20) r0 = accept4$alg(0xffffffffffffffff, 0x0, 0x0, 0x0) syz_genetlink_get_family_id$ethtool(&(0x7f00000000c0), r0) program did not crash testing program (duration=46.35547915s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool detailed listing: executing program 0: r0 = socket$alg(0x26, 0x5, 0x0) bind$alg(r0, 0x0, 0x0) setsockopt$ALG_SET_KEY(r0, 0x117, 0x1, &(0x7f0000000340)="71e67a15cdf0311cfcf33a52a7d86bd1", 0x20) r1 = accept4$alg(r0, 0x0, 0x0, 0x0) syz_genetlink_get_family_id$ethtool(&(0x7f00000000c0), r1) program did not crash testing program (duration=46.35547915s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool detailed listing: executing program 0: r0 = socket$alg(0x26, 0x5, 0x0) bind$alg(r0, &(0x7f0000000100)={0x26, 'aead\x00', 0x0, 0x0, 'pcrypt(generic-gcm-aesni)\x00'}, 0x58) setsockopt$ALG_SET_KEY(r0, 0x117, 0x1, 0x0, 0x0) r1 = accept4$alg(r0, 0x0, 0x0, 0x0) syz_genetlink_get_family_id$ethtool(&(0x7f00000000c0), r1) program did not crash testing program (duration=46.35547915s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool detailed listing: executing program 0: r0 = socket$alg(0x26, 0x5, 0x0) bind$alg(r0, &(0x7f0000000100)={0x26, 'aead\x00', 0x0, 0x0, 'pcrypt(generic-gcm-aesni)\x00'}, 0x58) setsockopt$ALG_SET_KEY(r0, 0x117, 0x1, &(0x7f0000000340), 0x0) r1 = accept4$alg(r0, 0x0, 0x0, 0x0) syz_genetlink_get_family_id$ethtool(&(0x7f00000000c0), r1) program did not crash testing program (duration=46.35547915s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool detailed listing: executing program 0: r0 = socket$alg(0x26, 0x5, 0x0) bind$alg(r0, &(0x7f0000000100)={0x26, 'aead\x00', 0x0, 0x0, 'pcrypt(generic-gcm-aesni)\x00'}, 0x58) setsockopt$ALG_SET_KEY(r0, 0x117, 0x1, &(0x7f0000000340)="71e67a15cdf0311cfcf33a52a7d86bd1", 0x20) r1 = accept4$alg(r0, 0x0, 0x0, 0x0) syz_genetlink_get_family_id$ethtool(0x0, r1) program did not crash extracting C reproducer testing compiled C program (duration=46.35547915s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool program crashed: possible deadlock in padata_do_serial simplifying C reproducer testing compiled C program (duration=46.35547915s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool program crashed: possible deadlock in padata_do_serial testing compiled C program (duration=46.35547915s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool program crashed: possible deadlock in padata_do_serial testing compiled C program (duration=46.35547915s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool program crashed: possible deadlock in padata_do_serial testing compiled C program (duration=46.35547915s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool program crashed: possible deadlock in padata_do_serial testing compiled C program (duration=46.35547915s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool program crashed: possible deadlock in padata_do_serial testing compiled C program (duration=46.35547915s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool program crashed: possible deadlock in padata_do_serial testing compiled C program (duration=46.35547915s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool program crashed: possible deadlock in padata_do_serial testing program (duration=46.35547915s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool detailed listing: executing program 0: r0 = socket$alg(0x26, 0x5, 0x0) bind$alg(r0, &(0x7f0000000100)={0x26, 'aead\x00', 0x0, 0x0, 'pcrypt(generic-gcm-aesni)\x00'}, 0x58) setsockopt$ALG_SET_KEY(r0, 0x117, 0x1, &(0x7f0000000340)="71e67a15cdf0311cfcf33a52a7d86bd1", 0x20) r1 = accept4$alg(r0, 0x0, 0x0, 0x0) syz_genetlink_get_family_id$ethtool(&(0x7f00000000c0), r1) program crashed: possible deadlock in padata_do_serial validation run: crashed=true testing program (duration=46.35547915s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool detailed listing: executing program 0: r0 = socket$alg(0x26, 0x5, 0x0) bind$alg(r0, &(0x7f0000000100)={0x26, 'aead\x00', 0x0, 0x0, 'pcrypt(generic-gcm-aesni)\x00'}, 0x58) setsockopt$ALG_SET_KEY(r0, 0x117, 0x1, &(0x7f0000000340)="71e67a15cdf0311cfcf33a52a7d86bd1", 0x20) r1 = accept4$alg(r0, 0x0, 0x0, 0x0) syz_genetlink_get_family_id$ethtool(&(0x7f00000000c0), r1) program crashed: possible deadlock in padata_do_serial validation run: crashed=true testing program (duration=46.35547915s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool detailed listing: executing program 0: r0 = socket$alg(0x26, 0x5, 0x0) bind$alg(r0, &(0x7f0000000100)={0x26, 'aead\x00', 0x0, 0x0, 'pcrypt(generic-gcm-aesni)\x00'}, 0x58) setsockopt$ALG_SET_KEY(r0, 0x117, 0x1, &(0x7f0000000340)="71e67a15cdf0311cfcf33a52a7d86bd1", 0x20) r1 = accept4$alg(r0, 0x0, 0x0, 0x0) syz_genetlink_get_family_id$ethtool(&(0x7f00000000c0), r1) program crashed: possible deadlock in padata_do_serial validation run: crashed=true reproducing took 25m53.094915293s repro crashed as (corrupted=false): ============================================ WARNING: possible recursive locking detected syzkaller #0 Not tainted -------------------------------------------- kworker/u8:1/13 is trying to acquire lock: ffffe8ffffd347d0 (&pd_list->lock){+...}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] ffffe8ffffd347d0 (&pd_list->lock){+...}-{3:3}, at: padata_find_next kernel/padata.c:256 [inline] ffffe8ffffd347d0 (&pd_list->lock){+...}-{3:3}, at: padata_reorder kernel/padata.c:313 [inline] ffffe8ffffd347d0 (&pd_list->lock){+...}-{3:3}, at: padata_do_serial+0x707/0xb80 kernel/padata.c:383 but task is already holding lock: ffffe8ffffd34820 (&pd_list->lock){+...}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] ffffe8ffffd34820 (&pd_list->lock){+...}-{3:3}, at: padata_reorder kernel/padata.c:304 [inline] ffffe8ffffd34820 (&pd_list->lock){+...}-{3:3}, at: padata_do_serial+0x590/0xb80 kernel/padata.c:383 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&pd_list->lock); lock(&pd_list->lock); *** DEADLOCK *** May be due to missing lock nesting notation 3 locks held by kworker/u8:1/13: #0: ffff88801e7e9148 ((wq_completion)pdecrypt_parallel){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3238 [inline] #0: ffff88801e7e9148 ((wq_completion)pdecrypt_parallel){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3346 #1: ffffc90000127ba0 ((work_completion)(&pw->pw_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3239 [inline] #1: ffffc90000127ba0 ((work_completion)(&pw->pw_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3346 #2: ffffe8ffffd34820 (&pd_list->lock){+...}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] #2: ffffe8ffffd34820 (&pd_list->lock){+...}-{3:3}, at: padata_reorder kernel/padata.c:304 [inline] #2: ffffe8ffffd34820 (&pd_list->lock){+...}-{3:3}, at: padata_do_serial+0x590/0xb80 kernel/padata.c:383 stack backtrace: CPU: 0 UID: 0 PID: 13 Comm: kworker/u8:1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Workqueue: pdecrypt_parallel padata_parallel_worker Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_deadlock_bug+0x28b/0x2a0 kernel/locking/lockdep.c:3041 check_deadlock kernel/locking/lockdep.c:3093 [inline] validate_chain+0x1a3f/0x2140 kernel/locking/lockdep.c:3895 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] padata_find_next kernel/padata.c:256 [inline] padata_reorder kernel/padata.c:313 [inline] padata_do_serial+0x707/0xb80 kernel/padata.c:383 padata_parallel_worker+0x75/0x1d0 kernel/padata.c:157 process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 final repro crashed as (corrupted=false): ============================================ WARNING: possible recursive locking detected syzkaller #0 Not tainted -------------------------------------------- kworker/u8:1/13 is trying to acquire lock: ffffe8ffffd347d0 (&pd_list->lock){+...}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] ffffe8ffffd347d0 (&pd_list->lock){+...}-{3:3}, at: padata_find_next kernel/padata.c:256 [inline] ffffe8ffffd347d0 (&pd_list->lock){+...}-{3:3}, at: padata_reorder kernel/padata.c:313 [inline] ffffe8ffffd347d0 (&pd_list->lock){+...}-{3:3}, at: padata_do_serial+0x707/0xb80 kernel/padata.c:383 but task is already holding lock: ffffe8ffffd34820 (&pd_list->lock){+...}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] ffffe8ffffd34820 (&pd_list->lock){+...}-{3:3}, at: padata_reorder kernel/padata.c:304 [inline] ffffe8ffffd34820 (&pd_list->lock){+...}-{3:3}, at: padata_do_serial+0x590/0xb80 kernel/padata.c:383 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&pd_list->lock); lock(&pd_list->lock); *** DEADLOCK *** May be due to missing lock nesting notation 3 locks held by kworker/u8:1/13: #0: ffff88801e7e9148 ((wq_completion)pdecrypt_parallel){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3238 [inline] #0: ffff88801e7e9148 ((wq_completion)pdecrypt_parallel){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3346 #1: ffffc90000127ba0 ((work_completion)(&pw->pw_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3239 [inline] #1: ffffc90000127ba0 ((work_completion)(&pw->pw_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3346 #2: ffffe8ffffd34820 (&pd_list->lock){+...}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] #2: ffffe8ffffd34820 (&pd_list->lock){+...}-{3:3}, at: padata_reorder kernel/padata.c:304 [inline] #2: ffffe8ffffd34820 (&pd_list->lock){+...}-{3:3}, at: padata_do_serial+0x590/0xb80 kernel/padata.c:383 stack backtrace: CPU: 0 UID: 0 PID: 13 Comm: kworker/u8:1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Workqueue: pdecrypt_parallel padata_parallel_worker Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_deadlock_bug+0x28b/0x2a0 kernel/locking/lockdep.c:3041 check_deadlock kernel/locking/lockdep.c:3093 [inline] validate_chain+0x1a3f/0x2140 kernel/locking/lockdep.c:3895 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] padata_find_next kernel/padata.c:256 [inline] padata_reorder kernel/padata.c:313 [inline] padata_do_serial+0x707/0xb80 kernel/padata.c:383 padata_parallel_worker+0x75/0x1d0 kernel/padata.c:157 process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245