syzbot
INFO: rcu detected stall in sys_kexec_load (3)
Status: auto-obsoleted due to no activity on 2026/07/17 10:36
Subsystems:
mm
Labels:
prio:low
[Documentation on labels]
First crash: 261d, last: 116d
Sample crash report:
bridge0: received packet on veth0_to_bridge with own address as source address (addr:b6:1c:87:c9:4e:44, vlan:0)
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6389/1:b..l
rcu: (detected by 1, t=10503 jiffies, g=18537, q=6223 ncpus=2)
task:syz.7.36 state:R running task stack:28024 pid:6389 tgid:6388 ppid:5988 task_flags:0x400140 flags:0x00080002
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:on_stack arch/x86/include/asm/stacktrace.h:59 [inline]
RIP: 0010:stack_access_ok+0x95/0x1d0 arch/x86/kernel/unwind_orc.c:409
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 0b 01 00 00 48 8b 43 10 49 39 ed 77 1a 48 39 e8 76 15 4a 8d 54 25 00 48 39 d0 0f 93 c0 <49> 39 d5 0f 92 c2 20 d0 75 38 48 8d 7b 28 48 8d 4b 20 48 b8 00 00
RSP: 0018:ffffc900032c7958 EFLAGS: 00000216
RAX: ffffc900032c8001 RBX: ffffc900032c79f8 RCX: ffffffff92305b40
RDX: ffffc900032c7f48 RSI: ffffc900032c7f40 RDI: ffffc900032c7a08
RBP: ffffc900032c7f40 R08: ffffffff92305b44 R09: 0000000000000007
R10: 0000000000000200 R11: 00000000000a9481 R12: 0000000000000008
R13: ffffc900032c0000 R14: ffffc900032c7f48 R15: ffffc900032c7a2c
deref_stack_reg arch/x86/kernel/unwind_orc.c:419 [inline]
unwind_next_frame+0xcf5/0x2090 arch/x86/kernel/unwind_orc.c:614
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:1404 [inline]
__free_frozen_pages+0x747/0x1040 mm/page_alloc.c:2945
kimage_free_page_list+0x130/0x240 kernel/kexec_core.c:325
kimage_alloc_normal_control_pages kernel/kexec_core.c:390 [inline]
kimage_alloc_control_pages+0x3f2/0xa20 kernel/kexec_core.c:471
kimage_alloc_init kernel/kexec.c:67 [inline]
do_kexec_load+0x275/0x810 kernel/kexec.c:130
__do_sys_kexec_load kernel/kexec.c:261 [inline]
__se_sys_kexec_load kernel/kexec.c:242 [inline]
__x64_sys_kexec_load+0x1bf/0x230 kernel/kexec.c:242
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: 0033:0x7f7223d9c819
RSP: 002b:00007f7224bb4028 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6
RAX: ffffffffffffffda RBX: 00007f7224015fa0 RCX: 00007f7223d9c819
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000005
RBP: 00007f7223e32c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7224016038 R14: 00007f7224015fa0 R15: 00007ffdb3f28df8
</TASK>
bridge0: received packet on veth0_to_bridge with own address as source address (addr:b6:1c:87:c9:4e:44, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:b6:1c:87:c9:4e:44, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:b6:1c:87:c9:4e:44, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:b6:1c:87:c9:4e:44, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:b6:1c:87:c9:4e:44, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:b6:1c:87:c9:4e:44, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:b6:1c:87:c9:4e:44, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:b6:1c:87:c9:4e:44, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:b6:1c:87:c9:4e:44, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:b6:1c:87:c9:4e:44, vlan:0)
Struck through repros no longer work on HEAD.