Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.22' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 73.405253][ T8589] block nbd0: NBD_DISCONNECT [ 73.436449][ T8589] general protection fault, probably for non-canonical address 0xdffffc0000000027: 0000 [#1] PREEMPT SMP KASAN [ 73.448531][ T8589] KASAN: null-ptr-deref in range [0x0000000000000138-0x000000000000013f] [ 73.458535][ T8589] CPU: 1 PID: 8589 Comm: systemd-udevd Not tainted 5.12.0-rc7-syzkaller #0 [ 73.467156][ T8589] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.477230][ T8589] RIP: 0010:__lock_acquire+0xcfe/0x54c0 [ 73.484834][ T8589] Code: 0e 0e 41 bf 01 00 00 00 0f 86 8c 00 00 00 89 05 68 14 0e 0e e9 81 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 5b 31 00 00 49 81 3e c0 c3 3c 8f 0f 84 d0 f3 ff [ 73.506746][ T8589] RSP: 0018:ffffc90001c97938 EFLAGS: 00010006 [ 73.513046][ T8589] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 73.521470][ T8589] RDX: 0000000000000027 RSI: 1ffff92000392f38 RDI: 0000000000000138 [ 73.529458][ T8589] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 [ 73.537792][ T8589] R10: 0000000000000001 R11: 0000000000000000 R12: ffff88801bd90000 [ 73.545972][ T8589] R13: 0000000000000000 R14: 0000000000000138 R15: 0000000000000000 [ 73.553970][ T8589] FS: 00007f4e928528c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 73.563030][ T8589] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 73.569639][ T8589] CR2: 00007fe9c0ba2000 CR3: 00000000122a0000 CR4: 00000000001506e0 [ 73.577640][ T8589] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 73.586258][ T8589] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 73.594256][ T8589] Call Trace: [ 73.597566][ T8589] ? __lock_acquire+0xb43/0x54c0 [ 73.602525][ T8589] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 73.608622][ T8589] lock_acquire+0x1ab/0x740 [ 73.613165][ T8589] ? flush_workqueue+0xe1/0x13e0 [ 73.618129][ T8589] ? lock_release+0x720/0x720 [ 73.622842][ T8589] ? lockdep_init_map_type+0x2c3/0x7b0 [ 73.628321][ T8589] ? hctx_unlock+0xb9/0x170 [ 73.632848][ T8589] ? lockdep_init_map_type+0x2c3/0x7b0 [ 73.638330][ T8589] flush_workqueue+0x110/0x13e0 [ 73.643208][ T8589] ? flush_workqueue+0xe1/0x13e0 [ 73.648171][ T8589] ? lock_downgrade+0x6e0/0x6e0 [ 73.653060][ T8589] ? hctx_unlock+0xe4/0x170 [ 73.657707][ T8589] ? check_flush_dependency+0x400/0x400 [ 73.663315][ T8589] nbd_disconnect_and_put+0x94/0x120 [ 73.668634][ T8589] nbd_release+0x165/0x1a0 [ 73.673086][ T8589] ? nbd_genl_disconnect+0x540/0x540 [ 73.678438][ T8589] __blkdev_put+0x54e/0x800 [ 73.682972][ T8589] ? __mutex_unlock_slowpath+0xe2/0x610 [ 73.688653][ T8589] ? freeze_bdev+0x250/0x250 [ 73.693286][ T8589] ? wait_for_completion_io+0x270/0x270 [ 73.698860][ T8589] ? _raw_spin_unlock+0x24/0x40 [ 73.703752][ T8589] ? locks_remove_file+0x312/0x560 [ 73.708889][ T8589] blkdev_put+0x92/0x580 [ 73.713345][ T8589] ? __sanitizer_cov_trace_const_cmp2+0x22/0x80 [ 73.719611][ T8589] blkdev_close+0x8c/0xb0 [ 73.723967][ T8589] __fput+0x288/0x920 [ 73.728002][ T8589] ? blkdev_put+0x580/0x580 [ 73.732532][ T8589] task_work_run+0xdd/0x1a0 [ 73.737178][ T8589] exit_to_user_mode_prepare+0x249/0x250 [ 73.742838][ T8589] syscall_exit_to_user_mode+0x19/0x60 [ 73.748336][ T8589] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 73.754522][ T8589] RIP: 0033:0x7f4e91998270 [ 73.759675][ T8589] Code: 73 01 c3 48 8b 0d 38 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 59 c1 20 00 00 75 10 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ee fb ff ff 48 89 04 24 [ 73.779407][ T8589] RSP: 002b:00007ffc2c2e4aa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 73.787837][ T8589] RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007f4e91998270 [ 73.795838][ T8589] RDX: 000000000aba9500 RSI: 0000000000000000 RDI: 0000000000000007 [ 73.803829][ T8589] RBP: 00007f4e92852710 R08: 0000000000000045 R09: 0000000000000018 [ 73.811818][ T8589] R10: 00005580fe983ec8 R11: 0000000000000246 R12: 0000000000000000 [ 73.819819][ T8589] R13: 00005580fe992780 R14: 0000000000000003 R15: 000000000000000e [ 73.827844][ T8589] Modules linked in: [ 73.831796][ T8589] ---[ end trace 75aeb15912115b94 ]--- [ 73.837270][ T8589] RIP: 0010:__lock_acquire+0xcfe/0x54c0 [ 73.842862][ T8589] Code: 0e 0e 41 bf 01 00 00 00 0f 86 8c 00 00 00 89 05 68 14 0e 0e e9 81 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 5b 31 00 00 49 81 3e c0 c3 3c 8f 0f 84 d0 f3 ff [ 73.862573][ T8589] RSP: 0018:ffffc90001c97938 EFLAGS: 00010006 [ 73.869136][ T8589] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 73.877119][ T8589] RDX: 0000000000000027 RSI: 1ffff92000392f38 RDI: 0000000000000138 [ 73.885104][ T8589] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 [ 73.893198][ T8589] R10: 0000000000000001 R11: 0000000000000000 R12: ffff88801bd90000 [ 73.901215][ T8589] R13: 0000000000000000 R14: 0000000000000138 R15: 0000000000000000 [ 73.909206][ T8589] FS: 00007f4e928528c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 73.918156][ T8589] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 73.924763][ T8589] CR2: 00007fe9c0ba2000 CR3: 00000000122a0000 CR4: 00000000001506e0 [ 73.932753][ T8589] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 73.940739][ T8589] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 73.948729][ T8589] Kernel panic - not syncing: Fatal exception [ 73.955328][ T8589] Kernel Offset: disabled [ 73.959782][ T8589] Rebooting in 86400 seconds..