ci starts bisection 2023-03-10 01:34:07.176850052 +0000 UTC m=+65787.299376595 bisecting fixing commit since 9b43a525db125799df81e6fbef712a2ae50bfc5d building syzkaller on 1dac8c7a01e2bdd35cb04eb4901ddb157291ac2d ensuring issue is reproducible on original commit 9b43a525db125799df81e6fbef712a2ae50bfc5d testing commit 9b43a525db125799df81e6fbef712a2ae50bfc5d gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 7c5da53b664aa5daa3e961b7734328cf9297c5a13f9dce2544dc19fdaffcd5de all runs: crashed: INFO: task hung in blkdev_put testing current HEAD 44889ba56cbb3d51154660ccd15818bc77276696 testing commit 44889ba56cbb3d51154660ccd15818bc77276696 gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: e8bd4585d18c675ee8c673de4a484a8e4936329d2a4926a5315b0e95c5ccd0f7 all runs: crashed: INFO: task hung in blkdev_put revisions tested: 2, total time: 29m53.73804751s (build: 17m50.268947958s, test: 11m31.601137932s) the crash still happens on HEAD commit msg: Merge tag 'net-6.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net crash: INFO: task hung in blkdev_put INFO: task syz-executor.0:5588 blocked for more than 143 seconds. Not tainted 6.3.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:25496 pid:5588 ppid:5508 flags:0x00004004 Call Trace: __schedule+0x17c3/0x4770 schedule+0xc3/0x180 schedule_preempt_disabled+0x13/0x20 __mutex_lock_common+0xe33/0x2530 mutex_lock_nested+0x1b/0x20 blkdev_put+0xe8/0x5c0 blkdev_close+0x55/0x80 __fput+0x33f/0x720 task_work_run+0x20a/0x290 exit_to_user_mode_loop+0xd9/0x100 exit_to_user_mode_prepare+0xb1/0x140 syscall_exit_to_user_mode+0x64/0x2e0 do_syscall_64+0x4d/0xc0 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f398548c0c9 RSP: 002b:00007f398621e168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 00007f39855abf80 RCX: 00007f398548c0c9 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 00007f39854e7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe7694afaf R14: 00007f398621e300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8bf17810 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 1 lock held by rcu_tasks_trace/13: #0: ffffffff8bf18010 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 1 lock held by khungtaskd/28: #0: ffffffff8bf17640 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 2 locks held by syslogd/4414: #0: ffff8880b9d3be18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 #1: ffff88807e8e36b0 (&mm->cid_lock){....}-{2:2}, at: __schedule+0x1211/0x4770 2 locks held by getty/4746: #0: ffff88802ae6c098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x20/0x60 #1: ffffc900015a02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x5ed/0x1880 1 lock held by udevd/5502: #0: ffff88801d9c04c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0xd6/0x8b0 1 lock held by syz-executor.0/5588: #0: ffff88801d9c04c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x5c0 1 lock held by syz-executor.0/6165: #0: ffff88801d9c04c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0xd6/0x8b0 1 lock held by syz-executor.0/6181: #0: ffff88801d9c04c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0xd6/0x8b0 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.3.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 Call Trace: dump_stack_lvl+0x167/0x220 nmi_cpu_backtrace+0x381/0x3f0 nmi_trigger_cpumask_backtrace+0x139/0x270 watchdog+0xb78/0xbc0 kthread+0x232/0x2b0 ret_from_fork+0x1f/0x30 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 9 Comm: kworker/u4:0 Not tainted 6.3.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 Workqueue: phy8 ieee80211_iface_work RIP: 0010:unwind_next_frame+0x0/0x2180 Code: 48 83 c0 f8 eb 02 31 c0 5b 41 5e 41 5f c3 44 89 f1 80 e1 07 80 c1 03 38 c1 7c 95 4c 89 f7 e8 87 a2 8e 00 eb 8b 0f 1f 44 00 00 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 81 ec 98 00 00 00 48 RSP: 0018:ffffc900000e71b8 EFLAGS: 00000283 RAX: ffffc900000e72b0 RBX: ffffc900000e7258 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: ffffc900000e8000 RDI: ffffc900000e7220 RBP: 1ffff9200001ce45 R08: dffffc0000000001 R09: ffffc900000e7220 R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff9200001ce46 R13: ffffc900000e7230 R14: ffffc900000e7220 R15: ffffc900000e7228 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055afeb88f600 CR3: 000000000bd26000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __unwind_start+0x5a1/0x720 arch_stack_walk+0xdf/0x140 stack_trace_save+0x117/0x1c0 kasan_set_track+0x4f/0x70 __kasan_kmalloc+0x98/0xb0 __kmalloc+0xb3/0x1a0 ieee802_11_parse_elems_full+0xef/0x2d10 ieee80211_ibss_rx_queued_mgmt+0x246/0x26f0 ieee80211_iface_work+0x596/0x9c0 process_one_work+0x7ee/0x1010 worker_thread+0x8c9/0xfd0 kthread+0x232/0x2b0 ret_from_fork+0x1f/0x30