INFO: task syz.4.4862:23010 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.4862 state:D stack:28760 pid:23010 tgid:23003 ppid:15933 task_flags:0x400040 flags:0x08080002
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1821/0x5740 kernel/sched/core.c:7189
__schedule_loop kernel/sched/core.c:7268 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7283
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7340
__mutex_lock_common kernel/locking/mutex.c:726 [inline]
__mutex_lock+0x7f7/0x1550 kernel/locking/mutex.c:820
blk_debugfs_lock_nomemsave block/blk.h:758 [inline]
blk_trace_remove+0x20/0x40 kernel/trace/blktrace.c:561
sg_ioctl_common drivers/scsi/sg.c:1124 [inline]
sg_ioctl+0x45b/0x2220 drivers/scsi/sg.c:1158
__do_compat_sys_ioctl fs/ioctl.c:695 [inline]
__se_compat_sys_ioctl fs/ioctl.c:638 [inline]
__ia32_compat_sys_ioctl+0x5ea/0x950 fs/ioctl.c:638
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x23e/0x6f0 arch/x86/entry/syscall_32.c:307
do_fast_syscall_32+0x33/0x70 arch/x86/entry/syscall_32.c:332
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf6fdf01c
RSP: 002b:00000000f53ac50c EFLAGS: 00000206 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 000000000000000b RCX: 0000000000001276
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Showing all locks held in the system:
2 locks held by init/1:
1 lock held by khungtaskd/31:
#0: ffffffff8e95cce0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8e95cce0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#0: ffffffff8e95cce0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
3 locks held by kworker/u8:2/36:
2 locks held by syslogd/4981:
1 lock held by udevd/5000:
3 locks held by dhcpcd/5295:
3 locks held by dhcpcd/5296:
#0: ffff888022af7178 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:611 [inline]
#0: ffff888022af7178 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/mmap_lock.c:441 [inline]
#0: ffff888022af7178 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x36/0x340 mm/mmap_lock.c:501
#1: ffffffff8ea85600 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4393 [inline]
#1: ffffffff8ea85600 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xbd/0x310 mm/page_alloc.c:4418
#2: ffff8880b863aee0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xb6/0x150 kernel/sched/core.c:660
3 locks held by dhcpcd/5297:
2 locks held by getty/5386:
#0: ffff8880328560a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000323b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0 drivers/tty/n_tty.c:2211
1 lock held by sshd-session/5616:
2 locks held by syz-executor/5617:
2 locks held by udevd/5632:
#0: ffff888034d66280 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1094 [inline]
#0: ffff888034d66280 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_fault+0x95e/0x1300 mm/filemap.c:3562
#1: ffffffff8ea85600 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4393 [inline]
#1: ffffffff8ea85600 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xbd/0x310 mm/page_alloc.c:4418
4 locks held by udevd/10146:
#0: ffff888022ec7878 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xb7/0xe10 fs/seq_file.c:183
#1: ffff888229a97880 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x5c/0x420 fs/kernfs/file.c:172
#2: ffff888021e88698 (kn->active#31){++++}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:80 [inline]
#2: ffff888021e88698 (kn->active#31){++++}-{0:0}, at: kernfs_seq_start+0xb2/0x420 fs/kernfs/file.c:173
#3: ffff8880788fa1d8 (&dev->mutex){....}-{4:4}, at: device_lock_interruptible include/linux/device.h:1045 [inline]
#3: ffff8880788fa1d8 (&dev->mutex){....}-{4:4}, at: manufacturer_show+0x26/0xa0 drivers/usb/core/sysfs.c:142
2 locks held by udevd/16443:
3 locks held by udevd/16445:
3 locks held by syz-executor/16755:
6 locks held by kworker/1:5/16854:
2 locks held by syz-executor/21324:
2 locks held by syz.4.4862/23004:
1 lock held by syz.4.4862/23010:
#0: ffff88802763f868 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_debugfs_lock_nomemsave block/blk.h:758 [inline]
#0: ffff88802763f868 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove+0x20/0x40 kernel/trace/blktrace.c:561
3 locks held by syz-executor/23279:
1 lock held by syz.3.4994/23504:
#0: ffff88802763f868 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_debugfs_lock_nomemsave block/blk.h:758 [inline]
#0: ffff88802763f868 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_debugfs_lock block/blk.h:770 [inline]
#0: ffff88802763f868 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x2d3/0x520 kernel/trace/blktrace.c:788
1 lock held by syz.3.4994/23507:
#0: ffff88802763f868 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_debugfs_lock_nomemsave block/blk.h:758 [inline]
#0: ffff88802763f868 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove+0x20/0x40 kernel/trace/blktrace.c:561
2 locks held by syz.7.5088/23832:
8 locks held by syz.0.5089/23833:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xfd3/0x1030 kernel/hung_task.c:561
kthread+0x389/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 23833 Comm: syz.0.5089 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:io_serial_in+0x77/0xc0 drivers/tty/serial/8250/8250_port.c:401
Code: e8 8e f3 80 fc 44 89 f9 d3 e3 49 83 c6 40 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 6f 49 ec fc 41 03 1e 89 da ec <0f> b6 c0 5b 41 5c 41 5e 41 5f c3 cc cc cc cc cc 44 89 f9 80 e1 07
RSP: 0000:ffffc90003756d98 EFLAGS: 00000006
RAX: 1ffffffff34f1b05 RBX: 00000000000003f9 RCX: 0000000000000000
RDX: 00000000000003f9 RSI: 0000000000000000 RDI: 0000000000000020
RBP: ffffc90003756f30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: ffffffff8544c3f0 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffffffff9a78dac0 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88812529f000(0063) knlGS:0000000056dbb480
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f70ee10e CR3: 0000000156cd6000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
serial_port_in include/linux/serial_core.h:806 [inline]
serial8250_console_write+0x540/0x1ba0 drivers/tty/serial/8250/8250_port.c:3321
console_emit_next_record kernel/printk/printk.c:3183 [inline]
console_flush_one_record kernel/printk/printk.c:3269 [inline]
console_flush_all+0x718/0xb20 kernel/printk/printk.c:3343
__console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
console_unlock+0xd1/0x1c0 kernel/printk/printk.c:3413
vprintk_emit+0x485/0x560 kernel/printk/printk.c:2479
_printk+0xdd/0x130 kernel/printk/printk.c:2504
dump_unreclaimable_slab+0x112/0x150 mm/slab_common.c:1167
dump_header+0x3b8/0x4c0 mm/oom_kill.c:470
oom_kill_process+0x3ab/0x970 mm/oom_kill.c:1031
out_of_memory+0x1141/0x1410 mm/oom_kill.c:1151
__alloc_pages_may_oom+0x1ea/0x330 mm/page_alloc.c:4111
__alloc_pages_slowpath+0x6c2/0xd40 mm/page_alloc.c:4909
__alloc_frozen_pages_noprof+0x322/0x380 mm/page_alloc.c:5234
alloc_pages_mpol+0x235/0x490 mm/mempolicy.c:2490
alloc_frozen_pages_noprof mm/mempolicy.c:2561 [inline]
alloc_pages_noprof+0xac/0x2a0 mm/mempolicy.c:2581
folio_alloc_noprof+0x1e/0x30 mm/mempolicy.c:2591
filemap_alloc_folio_noprof+0x111/0x470 mm/filemap.c:1014
__filemap_get_folio_mpol+0x3fc/0xb00 mm/filemap.c:2012
__filemap_get_folio include/linux/pagemap.h:763 [inline]
filemap_fault+0x98e/0x1300 mm/filemap.c:3565
__do_fault+0x138/0x2a0 mm/memory.c:5474
do_read_fault mm/memory.c:5909 [inline]
do_fault mm/memory.c:6043 [inline]
do_pte_missing+0x2093/0x33f0 mm/memory.c:4566
handle_pte_fault mm/memory.c:6427 [inline]
__handle_mm_fault mm/memory.c:6565 [inline]
handle_mm_fault+0x1bf2/0x3170 mm/memory.c:6734
do_user_addr_fault+0xa73/0x1340 arch/x86/mm/fault.c:1334
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0023:0xf70ee138
Code: Unable to access opcode bytes at 0xf70ee10e.
RSP: 002b:00000000f75cfa20 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 00000000ffffffff RCX: 00000000bfffffff
RDX: 000000000c230000 RSI: 000000000000003e RDI: 000000000c230000
RBP: 00000000f7fd5610 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000