------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(lock->magic != lock) WARNING: CPU: 0 PID: 4411 at kernel/locking/mutex.c:582 __mutex_lock_common+0x4c4/0xca8 kernel/locking/mutex.c:582 Modules linked in: CPU: 0 PID: 4411 Comm: udevd Not tainted 6.2.0-rc3-syzkaller-16369-g358a161a6a9e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __mutex_lock_common+0x4c4/0xca8 kernel/locking/mutex.c:582 lr : __mutex_lock_common+0x4c4/0xca8 kernel/locking/mutex.c:582 sp : ffff80000ff93b30 x29: ffff80000ff93ba0 x28: ffff80000f068000 x27: ffff0000cb02b940 x26: 0000000000000000 x25: ffff0000c609ce00 x24: 0000000000000002 x23: ffff80000867f530 x22: 0000000000000000 x21: 0000000000000000 x20: 0000000000000000 x19: ffff0000cb02b800 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000012 x12: ffff80000dadbaa0 x11: ff808000081cbbc8 x10: 0000000000000000 x9 : 52d299f931448700 x8 : 52d299f931448700 x7 : 4e5241575f534b43 x6 : ffff80000c11ee8c x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000100000000 x0 : 0000000000000028 Call trace: __mutex_lock_common+0x4c4/0xca8 kernel/locking/mutex.c:582 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 ep_send_events fs/eventpoll.c:1657 [inline] ep_poll+0x320/0xc70 fs/eventpoll.c:1823 do_epoll_wait+0x144/0x18c fs/eventpoll.c:2258 do_epoll_pwait fs/eventpoll.c:2292 [inline] __do_sys_epoll_pwait+0x110/0x214 fs/eventpoll.c:2305 __se_sys_epoll_pwait fs/eventpoll.c:2299 [inline] __arm64_sys_epoll_pwait+0x30/0x40 fs/eventpoll.c:2299 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x140 arch/arm64/kernel/syscall.c:197 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584 irq event stamp: 157433 hardirqs last enabled at (157433): [] local_daif_restore arch/arm64/include/asm/daifflags.h:75 [inline] hardirqs last enabled at (157433): [] el0_svc_common+0x40/0x220 arch/arm64/kernel/syscall.c:107 hardirqs last disabled at (157432): [] el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 softirqs last enabled at (156924): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (156922): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008 Mem abort info: ESR = 0x0000000096000044 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x04: level 0 translation fault Data abort info: ISV = 0, ISS = 0x00000044 CM = 0, WnR = 1 user pgtable: 4k pages, 48-bit VAs, pgdp=000000010cbcf000 [0000000000000008] pgd=0000000000000000, p4d=0000000000000000 Internal error: Oops: 0000000096000044 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 4411 Comm: udevd Tainted: G W 6.2.0-rc3-syzkaller-16369-g358a161a6a9e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 pstate: 804000c5 (Nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __list_splice include/linux/list.h:449 [inline] pc : list_splice_init include/linux/list.h:491 [inline] pc : ep_start_scan+0x13c/0x1b4 fs/eventpoll.c:624 lr : list_splice_init include/linux/list.h:491 [inline] lr : ep_start_scan+0x134/0x1b4 fs/eventpoll.c:624 sp : ffff80000ff93bd0 x29: ffff80000ff93bd0 x28: ffff80000ff93c78 x27: ffff0000cb02b940 x26: 0000000000000001 x25: ffff0000c609ce00 x24: ffff0000cb02b930 x23: 0000000000000000 x22: ffff0000cb02b930 x21: ffff0000cb02b940 x20: ffff80000ff93c98 x19: ffff0000cb02b800 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000012 x12: ffff80000dadbaa0 x11: ff8080000867df20 x10: 0000000000000000 x9 : 0000000000000000 x8 : ffff80000ff93c98 x7 : 4e5241575f534b43 x6 : ffff80000867df0c x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 00000000000000ff x1 : 0000000000000000 x0 : 0000000000000000 Call trace: __list_splice include/linux/list.h:447 [inline] list_splice_init include/linux/list.h:491 [inline] ep_start_scan+0x13c/0x1b4 fs/eventpoll.c:624 ep_send_events fs/eventpoll.c:1658 [inline] ep_poll+0x32c/0xc70 fs/eventpoll.c:1823 do_epoll_wait+0x144/0x18c fs/eventpoll.c:2258 do_epoll_pwait fs/eventpoll.c:2292 [inline] __do_sys_epoll_pwait+0x110/0x214 fs/eventpoll.c:2305 __se_sys_epoll_pwait fs/eventpoll.c:2299 [inline] __arm64_sys_epoll_pwait+0x30/0x40 fs/eventpoll.c:2299 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x140 arch/arm64/kernel/syscall.c:197 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584 Code: 54000160 97f0c33f f9400288 f9409e69 (f90006f4) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 54000160 b.eq 0x2c // b.none 4: 97f0c33f bl 0xffffffffffc30d00 8: f9400288 ldr x8, [x20] c: f9409e69 ldr x9, [x19, #312] * 10: f90006f4 str x20, [x23, #8] <-- trapping instruction