last executing test programs: kernel console output (not intermixed with test programs): Warning: Permanently added '[localhost]:46301' (ED25519) to the list of known hosts. syzkaller login: [ 106.168155][ T5876] cgroup: Unknown subsys name 'net' [ 106.325222][ T5876] cgroup: Unknown subsys name 'cpuset' [ 106.329762][ T5876] cgroup: Unknown subsys name 'rlimit' [ 106.468278][ T5941] [ 106.469423][ T5941] ===================================== [ 106.471768][ T5941] WARNING: bad unlock balance detected! [ 106.474222][ T5941] syzkaller #0 Not tainted [ 106.476089][ T5941] ------------------------------------- [ 106.478539][ T5941] dhcpcd-run-hook/5941 is trying to release lock (rcu_read_lock) at: [ 106.481973][ T5941] [] rcu_read_unlock+0x2d/0xb0 [ 106.484937][ T5941] but there are no more locks to release! [ 106.487357][ T5941] [ 106.487357][ T5941] other info that might help us debug this: [ 106.490939][ T5941] 1 lock held by dhcpcd-run-hook/5941: [ 106.493348][ T5941] #0: ffff8880440f3d48 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x11d/0x590 [ 106.497373][ T5941] [ 106.497373][ T5941] stack backtrace: [ 106.499893][ T5941] CPU: 2 UID: 0 PID: 5941 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT(full) [ 106.499916][ T5941] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 106.499927][ T5941] Call Trace: [ 106.500016][ T5941] [ 106.500025][ T5941] dump_stack_lvl+0x100/0x190 [ 106.500050][ T5941] ? rcu_read_unlock+0x2d/0xb0 [ 106.500076][ T5941] print_unlock_imbalance_bug.part.0+0xfb/0x106 [ 106.500106][ T5941] ? rcu_read_unlock+0x2d/0xb0 [ 106.500131][ T5941] lock_release+0x28d/0x310 [ 106.500151][ T5941] rcu_read_unlock+0x32/0xb0 [ 106.500367][ T5941] do_wp_page+0x13d7/0x4350 [ 106.500392][ T5941] ? __pfx_do_wp_page+0x10/0x10 [ 106.500415][ T5941] ? __pfx_do_raw_spin_lock+0x10/0x10 [ 106.500437][ T5941] __handle_mm_fault+0x1ab6/0x2a00 [ 106.500465][ T5941] ? reacquire_held_locks+0xce/0x1e0 [ 106.500483][ T5941] ? __pfx___handle_mm_fault+0x10/0x10 [ 106.500509][ T5941] ? lock_vma_under_rcu+0x17c/0x590 [ 106.500539][ T5941] handle_mm_fault+0x36d/0xa20 [ 106.500566][ T5941] do_user_addr_fault+0x5a3/0x12f0 [ 106.500591][ T5941] exc_page_fault+0x6f/0xd0 [ 106.500618][ T5941] asm_exc_page_fault+0x26/0x30 [ 106.500636][ T5941] RIP: 0033:0x7f7501c33f87 [ 106.500654][ T5941] Code: 5c 25 28 49 8b 57 10 48 85 db 74 27 8b 74 24 0c 23 73 08 44 39 f6 75 16 48 39 c2 75 05 e8 62 ff ff ff 48 8b 53 10 48 83 c0 08 <48> 89 50 f8 48 8b 1b eb d0 49 83 c4 08 49 81 fc 38 01 00 00 75 be [ 106.500671][ T5941] RSP: 002b:00007ffd29921270 EFLAGS: 00010212 [ 106.500688][ T5941] RAX: 00005645dcc81140 RBX: 00005645dcc716d0 RCX: 0000000000000002 [ 106.500700][ T5941] RDX: 00007ffd29925f83 RSI: 0000000000000001 RDI: 0000000000000001 [ 106.500711][ T5941] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 106.500720][ T5941] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000008 [ 106.500731][ T5941] R13: 00005645dcc70e60 R14: 0000000000000001 R15: 00005645dcc70c30 [ 106.500748][ T5941] [ 106.583590][ T5941] ------------[ cut here ]------------ [ 106.585799][ T5941] rrln < 0 || rrln > RCU_NEST_PMAX [ 106.585807][ T5941] WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x235/0x5e0, CPU#3: dhcpcd-run-hook/5941 [ 106.598469][ T5941] Modules linked in: [ 106.599873][ T5941] CPU: 3 UID: 0 PID: 5941 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT(full) [ 106.603068][ T5941] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 106.606430][ T5941] RIP: 0010:__rcu_read_unlock+0x235/0x5e0 [ 106.608524][ T5941] Code: 74 11 c7 45 58 01 00 00 00 bf 09 00 00 00 e8 12 a5 da ff e8 9d e2 22 00 9c 58 f6 c4 02 0f 85 dd 02 00 00 fb e9 57 fe ff ff 90 <0f> 0b 90 5b 5d 41 5c 41 5d 41 5e 41 5f e9 d9 14 ad 09 e8 44 64 87 [ 106.631760][ T5941] RSP: 0000:ffffc900049c7af0 EFLAGS: 00010286 [ 106.633778][ T5941] RAX: 00000000ffffffff RBX: ffff888029ec4a00 RCX: ffffffff81e80bfe [ 106.636733][ T5941] RDX: 0000000000000000 RSI: ffffffff8df2fec2 RDI: ffff888029ec4ec4 [ 106.639232][ T5941] RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000 [ 106.698987][ T5941] R10: 0000000080000000 R11: 0000000000000012 R12: ffff88802ad93408 [ 106.717097][ T5941] R13: ffffea0000ad7800 R14: 0000000000000000 R15: ffffea0000ad7800 [ 106.719872][ T5941] FS: 00007f7501945c80(0000) GS:ffff8880973e2000(0000) knlGS:0000000000000000 [ 106.723049][ T5941] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 106.725135][ T5941] CR2: 00005645dcc70950 CR3: 00000000297d6000 CR4: 0000000000352ef0 [ 106.727584][ T5941] Call Trace: [ 106.728754][ T5941] [ 106.730369][ T5941] do_wp_page+0x13d7/0x4350 [ 106.842677][ T5941] ? __pfx_do_wp_page+0x10/0x10 [ 106.845234][ T5941] ? __pfx_do_raw_spin_lock+0x10/0x10 [ 106.848508][ T5941] __handle_mm_fault+0x1ab6/0x2a00 [ 106.852086][ T5941] ? reacquire_held_locks+0xce/0x1e0 [ 106.854286][ T5941] ? __pfx___handle_mm_fault+0x10/0x10 [ 106.857298][ T5941] ? lock_vma_under_rcu+0x17c/0x590 [ 106.861942][ T5941] handle_mm_fault+0x36d/0xa20 [ 106.864846][ T5941] do_user_addr_fault+0x5a3/0x12f0 [ 106.868123][ T5941] exc_page_fault+0x6f/0xd0 [ 106.870335][ T5941] asm_exc_page_fault+0x26/0x30 [ 106.872207][ T5941] RIP: 0033:0x7f7501c33f87 [ 106.873759][ T5941] Code: 5c 25 28 49 8b 57 10 48 85 db 74 27 8b 74 24 0c 23 73 08 44 39 f6 75 16 48 39 c2 75 05 e8 62 ff ff ff 48 8b 53 10 48 83 c0 08 <48> 89 50 f8 48 8b 1b eb d0 49 83 c4 08 49 81 fc 38 01 00 00 75 be [ 106.880228][ T5941] RSP: 002b:00007ffd29921270 EFLAGS: 00010212 [ 106.882490][ T5941] RAX: 00005645dcc81140 RBX: 00005645dcc716d0 RCX: 0000000000000002 [ 106.885263][ T5941] RDX: 00007ffd29925f83 RSI: 0000000000000001 RDI: 0000000000000001 [ 106.887823][ T5941] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 106.890433][ T5941] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000008 [ 106.893095][ T5941] R13: 00005645dcc70e60 R14: 0000000000000001 R15: 00005645dcc70c30 [ 106.897893][ T5941] [ 106.898920][ T5941] Kernel panic - not syncing: kernel: panic_on_warn set ... [ 106.901378][ T5941] CPU: 3 UID: 0 PID: 5941 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT(full) [ 106.904741][ T5941] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 106.908088][ T5941] Call Trace: [ 106.909349][ T5941] [ 106.910413][ T5941] dump_stack_lvl+0x100/0x190 [ 106.912650][ T5941] vpanic+0x552/0x970 [ 106.914322][ T5941] ? __pfx_vpanic+0x10/0x10 [ 106.917949][ T5941] panic+0xd1/0xe0 [ 106.919773][ T5941] ? __pfx_panic+0x10/0x10 [ 106.923148][ T5941] ? check_panic_on_warn+0x1f/0x90 [ 106.925471][ T5941] check_panic_on_warn.cold+0x19/0x34 [ 106.927642][ T5941] ? __rcu_read_unlock+0x235/0x5e0 [ 106.929538][ T5941] __warn.cold+0x191/0x328 [ 106.932006][ T5941] __report_bug+0x296/0x3d0 [ 106.933752][ T5941] ? __rcu_read_unlock+0x235/0x5e0 [ 106.936332][ T5941] ? __pfx___report_bug+0x10/0x10 [ 106.938208][ T5941] ? is_bpf_text_address+0x8a/0x1a0 [ 106.940126][ T5941] ? lock_release+0x245/0x310 [ 106.941833][ T5941] ? bpf_ksym_find+0x124/0x1c0 [ 106.944264][ T5941] ? __pfx___schedule+0x10/0x10 [ 106.946011][ T5941] ? is_bpf_text_address+0x6f/0x1a0 [ 106.948300][ T5941] ? preempt_schedule_irq+0x7b/0x90 [ 106.951074][ T5941] ? __rcu_read_unlock+0x235/0x5e0 [ 106.953383][ T5941] report_bug+0xb2/0x220 [ 106.955301][ T5941] ? __rcu_read_unlock+0x235/0x5e0 [ 106.957332][ T5941] handle_bug+0x16a/0x2a0 [ 106.959266][ T5941] exc_invalid_op+0x17/0x50 [ 106.961150][ T5941] asm_exc_invalid_op+0x1a/0x20 [ 106.962891][ T5941] RIP: 0010:__rcu_read_unlock+0x235/0x5e0 [ 106.964864][ T5941] Code: 74 11 c7 45 58 01 00 00 00 bf 09 00 00 00 e8 12 a5 da ff e8 9d e2 22 00 9c 58 f6 c4 02 0f 85 dd 02 00 00 fb e9 57 fe ff ff 90 <0f> 0b 90 5b 5d 41 5c 41 5d 41 5e 41 5f e9 d9 14 ad 09 e8 44 64 87 [ 106.971316][ T5941] RSP: 0000:ffffc900049c7af0 EFLAGS: 00010286 [ 106.973776][ T5941] RAX: 00000000ffffffff RBX: ffff888029ec4a00 RCX: ffffffff81e80bfe [ 106.976420][ T5941] RDX: 0000000000000000 RSI: ffffffff8df2fec2 RDI: ffff888029ec4ec4 [ 106.978957][ T5941] RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000 [ 106.981484][ T5941] R10: 0000000080000000 R11: 0000000000000012 R12: ffff88802ad93408 [ 106.983984][ T5941] R13: ffffea0000ad7800 R14: 0000000000000000 R15: ffffea0000ad7800 [ 106.987844][ T5941] ? nbcon_cpu_emergency_exit+0x11e/0x1e0 [ 106.991901][ T5941] do_wp_page+0x13d7/0x4350 [ 106.995569][ T5941] ? __pfx_do_wp_page+0x10/0x10 [ 106.998193][ T5941] ? __pfx_do_raw_spin_lock+0x10/0x10 [ 107.001608][ T5941] __handle_mm_fault+0x1ab6/0x2a00 [ 107.004984][ T5941] ? reacquire_held_locks+0xce/0x1e0 [ 107.007303][ T5941] ? __pfx___handle_mm_fault+0x10/0x10 [ 107.010605][ T5941] ? lock_vma_under_rcu+0x17c/0x590 [ 107.015736][ T5941] handle_mm_fault+0x36d/0xa20 [ 107.019642][ T5941] do_user_addr_fault+0x5a3/0x12f0 [ 107.023258][ T5941] exc_page_fault+0x6f/0xd0 [ 107.025419][ T5941] asm_exc_page_fault+0x26/0x30 [ 107.027159][ T5941] RIP: 0033:0x7f7501c33f87 [ 107.028809][ T5941] Code: 5c 25 28 49 8b 57 10 48 85 db 74 27 8b 74 24 0c 23 73 08 44 39 f6 75 16 48 39 c2 75 05 e8 62 ff ff ff 48 8b 53 10 48 83 c0 08 <48> 89 50 f8 48 8b 1b eb d0 49 83 c4 08 49 81 fc 38 01 00 00 75 be [ 107.035351][ T5941] RSP: 002b:00007ffd29921270 EFLAGS: 00010212 [ 107.037466][ T5941] RAX: 00005645dcc81140 RBX: 00005645dcc716d0 RCX: 0000000000000002 [ 107.039955][ T5941] RDX: 00007ffd29925f83 RSI: 0000000000000001 RDI: 0000000000000001 [ 107.042456][ T5941] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 107.045098][ T5941] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000008 [ 107.047595][ T5941] R13: 00005645dcc70e60 R14: 0000000000000001 R15: 00005645dcc70c30 [ 107.053168][ T5941] [ 107.054913][ T5941] Kernel Offset: disabled [ 107.056584][ T5941] Rebooting in 86400 seconds..