[ OK ] Started Getty on tty1. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ OK ] Found device /dev/ttyS0. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Reached target Login Prompts. [ OK ] Started OpenBSD Secure Shell server. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.12' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 35.398783] FAULT_INJECTION: forcing a failure. [ 35.398783] name failslab, interval 1, probability 0, space 0, times 1 [ 35.410344] CPU: 1 PID: 8099 Comm: syz-executor481 Not tainted 4.19.211-syzkaller #0 [ 35.418591] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.427927] Call Trace: [ 35.430504] dump_stack+0x1fc/0x2ef [ 35.434120] should_fail.cold+0xa/0xf [ 35.437922] ? setup_fault_attr+0x200/0x200 [ 35.442314] ? should_fail+0x142/0x7b0 [ 35.446194] __should_failslab+0x115/0x180 [ 35.450418] should_failslab+0x5/0x10 [ 35.454203] kmem_cache_alloc_node_trace+0x244/0x3b0 [ 35.459290] __kmalloc_node+0x38/0x70 [ 35.463080] sbitmap_init_node+0x123/0x440 [ 35.467301] blk_mq_realloc_hw_ctxs+0x5db/0x1000 [ 35.472045] blk_mq_update_nr_hw_queues+0x557/0xb50 [ 35.477042] ? workqueue_sysfs_register+0x391/0x3e0 [ 35.482147] ? blk_mq_init_queue+0xa0/0xa0 [ 35.486394] ? apparmor_sb_mount+0x970/0x970 [ 35.490790] nbd_start_device+0x1f2/0xd60 [ 35.494925] ? security_capable+0x8f/0xc0 [ 35.499055] nbd_ioctl+0x62c/0xbe0 [ 35.502599] ? _copy_from_user+0xd2/0x130 [ 35.506730] ? nbd_disconnect_and_put+0x190/0x190 [ 35.511554] ? get_pid_task+0xcd/0x190 [ 35.515425] ? check_preemption_disabled+0x41/0x280 [ 35.520421] ? lock_downgrade+0x720/0x720 [ 35.524567] ? nbd_disconnect_and_put+0x190/0x190 [ 35.529394] blkdev_ioctl+0x5cb/0x1a80 [ 35.533260] ? blkpg_ioctl+0x9d0/0x9d0 [ 35.537221] ? get_pid_task+0xf4/0x190 [ 35.541095] ? proc_fail_nth_write+0x95/0x1d0 [ 35.545569] ? proc_tgid_io_accounting+0x7f0/0x7f0 [ 35.550480] ? debug_check_no_obj_freed+0x201/0x490 [ 35.555481] block_ioctl+0xe9/0x130 [ 35.559089] ? blkdev_fallocate+0x3f0/0x3f0 [ 35.563391] do_vfs_ioctl+0xcdb/0x12e0 [ 35.567263] ? vfs_write+0x3d7/0x540 [ 35.570962] ? ioctl_preallocate+0x200/0x200 [ 35.575352] ? lock_downgrade+0x720/0x720 [ 35.579483] ? check_preemption_disabled+0x41/0x280 [ 35.584490] ? vfs_write+0x393/0x540 [ 35.588227] ? ksys_write+0x1c8/0x2a0 [ 35.592012] ksys_ioctl+0x9b/0xc0 [ 35.595454] __x64_sys_ioctl+0x6f/0xb0 [ 35.599321] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 35.603903] do_syscall_64+0xf9/0x620 [ 35.607711] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.612892] RIP: 0033:0x7f997edacdc9 [ 35.616601] Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 [ 35.635486] RSP: 002b:00007ffe252c17c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 35.643174] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f997edacdc9 [ 35.650422] RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007 [ 35.657671] RBP: 00007ffe252c17d0 R08: 0000000000000002 R09: 00007f997e003331 [ 35.664931] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 [ 35.672196] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 35.688731] BUG: unable to handle kernel NULL pointer dereference at 0000000000000118 [ 35.696709] PGD ab2b5067 P4D ab2b5067 PUD a9af7067 PMD 0 [ 35.702230] Oops: 0002 [#1] PREEMPT SMP KASAN [ 35.706731] CPU: 0 PID: 8099 Comm: syz-executor481 Not tainted 4.19.211-syzkaller #0 [ 35.714585] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.723940] RIP: 0010:blk_mq_map_swqueue+0x287/0xa20 [ 35.729041] Code: c1 ea 03 80 3c 1a 00 0f 85 cf 06 00 00 89 ee bf 07 00 00 00 4d 8b 3f e8 47 04 fd fd 83 fd 07 0f 87 04 05 00 00 e8 c9 02 fd fd 4d 0f ab b7 18 01 00 00 49 8d bf 74 01 00 00 48 89 fa 48 c1 ea [ 35.747935] RSP: 0018:ffff888095007920 EFLAGS: 00010293 [ 35.753276] RAX: ffff8880b4014540 RBX: dffffc0000000000 RCX: ffffffff83658299 [ 35.760538] RDX: 0000000000000000 RSI: ffffffff836582a7 RDI: 0000000000000005 [ 35.767785] RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000007 [ 35.775032] R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880ae054080 [ 35.782281] R13: ffffe8ffffd37f80 R14: 0000000000000001 R15: 0000000000000000 [ 35.789530] FS: 0000555556a38300(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 35.797834] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.803692] CR2: 0000000000000118 CR3: 00000000abecf000 CR4: 00000000003406f0 [ 35.810944] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.818192] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.825700] Call Trace: [ 35.828360] blk_mq_update_nr_hw_queues+0x5bb/0xb50 [ 35.833372] ? workqueue_sysfs_register+0x391/0x3e0 [ 35.838386] ? blk_mq_init_queue+0xa0/0xa0 [ 35.842626] ? apparmor_sb_mount+0x970/0x970 [ 35.847044] nbd_start_device+0x1f2/0xd60 [ 35.851174] ? security_capable+0x8f/0xc0 [ 35.855301] nbd_ioctl+0x62c/0xbe0 [ 35.858821] ? _copy_from_user+0xd2/0x130 [ 35.862949] ? nbd_disconnect_and_put+0x190/0x190 [ 35.867771] ? get_pid_task+0xcd/0x190 [ 35.871638] ? check_preemption_disabled+0x41/0x280 [ 35.876631] ? lock_downgrade+0x720/0x720 [ 35.880757] ? nbd_disconnect_and_put+0x190/0x190 [ 35.885594] blkdev_ioctl+0x5cb/0x1a80 [ 35.889460] ? blkpg_ioctl+0x9d0/0x9d0 [ 35.893330] ? get_pid_task+0xf4/0x190 [ 35.897200] ? proc_fail_nth_write+0x95/0x1d0 [ 35.901678] ? proc_tgid_io_accounting+0x7f0/0x7f0 [ 35.906715] ? debug_check_no_obj_freed+0x201/0x490 [ 35.911975] block_ioctl+0xe9/0x130 [ 35.915581] ? blkdev_fallocate+0x3f0/0x3f0 [ 35.919977] do_vfs_ioctl+0xcdb/0x12e0 [ 35.923842] ? vfs_write+0x3d7/0x540 [ 35.927535] ? ioctl_preallocate+0x200/0x200 [ 35.931922] ? lock_downgrade+0x720/0x720 [ 35.936050] ? check_preemption_disabled+0x41/0x280 [ 35.941042] ? vfs_write+0x393/0x540 [ 35.944733] ? ksys_write+0x1c8/0x2a0 [ 35.948508] ksys_ioctl+0x9b/0xc0 [ 35.951943] __x64_sys_ioctl+0x6f/0xb0 [ 35.955808] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 35.960365] do_syscall_64+0xf9/0x620 [ 35.964178] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.969345] RIP: 0033:0x7f997edacdc9 [ 35.973053] Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 [ 35.992126] RSP: 002b:00007ffe252c17c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 35.999810] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f997edacdc9 [ 36.007072] RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007 [ 36.014321] RBP: 00007ffe252c17d0 R08: 0000000000000002 R09: 00007f997e003331 [ 36.021571] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 [ 36.028826] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 36.036076] Modules linked in: [ 36.039245] CR2: 0000000000000118 [ 36.042707] ---[ end trace baebab44d72bb111 ]--- [ 36.047536] RIP: 0010:blk_mq_map_swqueue+0x287/0xa20 [ 36.052619] Code: c1 ea 03 80 3c 1a 00 0f 85 cf 06 00 00 89 ee bf 07 00 00 00 4d 8b 3f e8 47 04 fd fd 83 fd 07 0f 87 04 05 00 00 e8 c9 02 fd fd 4d 0f ab b7 18 01 00 00 49 8d bf 74 01 00 00 48 89 fa 48 c1 ea [ 36.071497] RSP: 0018:ffff888095007920 EFLAGS: 00010293 [ 36.076836] RAX: ffff8880b4014540 RBX: dffffc0000000000 RCX: ffffffff83658299 [ 36.084087] RDX: 0000000000000000 RSI: ffffffff836582a7 RDI: 0000000000000005 [ 36.091336] RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000007 [ 36.098583] R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880ae054080 [ 36.105831] R13: ffffe8ffffd37f80 R14: 0000000000000001 R15: 0000000000000000 [ 36.113080] FS: 0000555556a38300(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 36.121385] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.127249] CR2: 0000000000000118 CR3: 00000000abecf000 CR4: 00000000003406f0 [ 36.134502] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.141748] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.148992] Kernel panic - not syncing: Fatal exception [ 36.154404] Kernel Offset: disabled [ 36.158011] Rebooting in 86400 seconds..