syzbot
INFO: rcu detected stall in kernel_mbind (4)
Status: auto-obsoleted due to no activity on 2026/07/21 03:14
Subsystems:
mm
Labels:
prio:high
[Documentation on labels]
First crash: 111d, last: 111d
Sample crash report:
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P25427/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=342213, q=460 ncpus=1)
task:syz.0.6743 state:R running task stack:26552 pid:25427 tgid:25426 ppid:5837 task_flags:0x400140 flags:0x00080000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x10e9/0x6820 kernel/sched/core.c:7188
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7512
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:476 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:547 [inline]
irqentry_exit+0x1fe/0x790 kernel/entry/common.c:164
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_release+0x19e/0x310 kernel/locking/lockdep.c:5893
Code: ff 65 0f c1 05 db 59 2f 12 83 f8 01 0f 85 28 01 00 00 9c 58 f6 c4 02 0f 85 13 01 00 00 41 f7 c6 00 02 00 00 0f 85 c0 00 00 00 <48> 8b 44 24 10 65 48 2b 05 2d 12 2f 12 0f 85 4e 01 00 00 48 83 c4
RSP: 0018:ffffc90005a2f2c8 EFLAGS: 00000206
RAX: 0000000000000046 RBX: ffffffff8e7e5260 RCX: ffffc90005a2f2d4
RDX: 0000000000000000 RSI: ffffffff8df2fec2 RDI: ffffffff8c1c1080
RBP: ffffffff81b851ae R08: 0000000000000001 R09: 0000000000000007
R10: 0000000000000200 R11: 00000000000176f2 R12: ffff8880790ddc40
R13: ffffc90005a2f380 R14: 0000000000000202 R15: 0000000000000001
rcu_lock_release include/linux/rcupdate.h:310 [inline]
rcu_read_unlock include/linux/rcupdate.h:869 [inline]
class_rcu_destructor include/linux/rcupdate.h:1181 [inline]
unwind_next_frame+0x3c3/0x2090 arch/x86/kernel/unwind_orc.c:495
arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
save_stack+0x162/0x1e0 mm/page_owner.c:165
__reset_page_owner+0x84/0x190 mm/page_owner.c:320
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1402 [inline]
__free_frozen_pages+0x747/0x1040 mm/page_alloc.c:2943
__folio_put+0x3b4/0x5f0 mm/swap.c:112
folio_put include/linux/mm.h:2090 [inline]
migrate_folio_done+0x3a9/0x4c0 mm/migrate.c:1201
migrate_folio_move mm/migrate.c:1432 [inline]
migrate_folios_move mm/migrate.c:1740 [inline]
migrate_pages_batch+0x27dc/0x45c0 mm/migrate.c:1996
migrate_pages_sync+0x12c/0x880 mm/migrate.c:2026
migrate_pages+0x1aa5/0x2880 mm/migrate.c:2135
do_mbind+0x5a4/0xfd0 mm/mempolicy.c:1614
kernel_mbind+0x1b7/0x200 mm/mempolicy.c:1757
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9c0a59c819
RSP: 002b:00007f9c0b3d7028 EFLAGS: 00000246 ORIG_RAX: 00000000000000ed
RAX: ffffffffffffffda RBX: 00007f9c0a815fa0 RCX: 00007f9c0a59c819
RDX: 0000000100000000 RSI: 0000000100000004 RDI: 0000000000000000
RBP: 00007f9c0a632c91 R08: 0000000000000006 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9c0a816038 R14: 00007f9c0a815fa0 R15: 00007ffede21ede8
</TASK>
net_ratelimit: 43013 callbacks suppressed
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:da:45:77:d9:9a:5d, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:da:45:77:d9:9a:5d, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
net_ratelimit: 34376 callbacks suppressed
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:da:45:77:d9:9a:5d, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:da:45:77:d9:9a:5d, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:da:45:77:d9:9a:5d, vlan:0)
Struck through repros no longer work on HEAD.