ci starts bisection 2023-04-09 02:05:51.97114464 +0000 UTC m=+90666.449614211 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: f5d21c4fb31799d9b7896d817bd451687e60a356fb51a9998c3eeb30d1d2a2d6 all runs: crashed: INFO: task hung in blkdev_put testing current HEAD 68047c48b2288803c441df9f3e61d0d26bed87df testing commit 68047c48b2288803c441df9f3e61d0d26bed87df gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 58b9349b3112defb79ceef7282d6306500f2c6293a2bef01dd1a8210e54e18a8 all runs: crashed: INFO: task hung in blkdev_put revisions tested: 2, total time: 30m24.891938647s (build: 18m4.320335662s, test: 11m41.809605874s) the crash still happens on HEAD commit msg: Merge tag 'char-misc-6.3-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc crash: INFO: task hung in blkdev_put INFO: task syz-executor.0:5584 blocked for more than 143 seconds. Not tainted 6.3.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:26448 pid:5584 ppid:5487 flags:0x00004006 Call Trace: __schedule+0x1717/0x45f0 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 get_signal+0x1144/0x12e0 arch_do_signal_or_restart+0x91/0x670 exit_to_user_mode_loop+0x6a/0x100 exit_to_user_mode_prepare+0xb1/0x140 syscall_exit_to_user_mode+0x64/0x280 do_syscall_64+0x4d/0xc0 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f220928c0c9 RSP: 002b:00007f2209f9c168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 00007f22093abf80 RCX: 00007f220928c0c9 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 00007f22092e7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff68d21bff R14: 00007f2209f9c300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8bf16f50 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 1 lock held by rcu_tasks_trace/13: #0: ffffffff8bf17750 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 1 lock held by khungtaskd/28: #0: ffffffff8bf16d80 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 2 locks held by getty/4735: #0: ffff88802acf9098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x20/0x60 #1: ffffc900015802f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x5ed/0x1880 1 lock held by udevd/5479: #0: ffff88801ce8c4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0xd6/0x8b0 1 lock held by syz-executor.0/5584: #0: ffff88801ce8c4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x5c0 1 lock held by syz-executor.0/6200: #0: ffff88801ce8c4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0xd6/0x8b0 1 lock held by syz-executor.0/6217: #0: ffff88801ce8c4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0xd6/0x8b0 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.3.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Call Trace: dump_stack_lvl+0x167/0x220 nmi_cpu_backtrace+0x34f/0x380 nmi_trigger_cpumask_backtrace+0x103/0x1f0 watchdog+0xa7c/0xac0 kthread+0x232/0x2b0 ret_from_fork+0x1f/0x30 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 811 Comm: kworker/u4:3 Not tainted 6.3.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Workqueue: phy9 ieee80211_iface_work RIP: 0010:validate_chain+0x173/0x58e0 Code: b8 eb 83 b5 80 46 86 c8 61 49 0f af c6 48 c1 e8 2f 48 8d 1c c5 40 11 ee 8e 48 89 d8 48 c1 e8 03 48 89 44 24 58 42 80 3c 20 00 <74> 08 48 89 df e8 b3 31 62 00 48 89 5c 24 20 48 8b 1b 48 85 db 74 RSP: 0018:ffffc90004066de0 EFLAGS: 00000046 RAX: 1ffffffff1df4010 RBX: ffffffff8efa0080 RCX: ffffffff8160a4c9 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8f021278 RBP: ffffc90004067090 R08: dffffc0000000000 R09: fffffbfff1e04250 R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000 R13: ffff88801ced8ad0 R14: 6bd50f97703d2ec0 R15: 1ffff110039db15a FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005634c440c680 CR3: 000000000bd26000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __lock_acquire+0x125b/0x1f80 lock_acquire+0x1e1/0x520 _raw_spin_lock_bh+0x35/0x50 cfg80211_bss_update+0x7c/0x1a60 cfg80211_inform_bss_frame_data+0xa4f/0x2020 ieee80211_bss_info_update+0x5f0/0xcc0 ieee80211_ibss_rx_queued_mgmt+0x11ac/0x25d0 ieee80211_iface_work+0x596/0x9c0 process_one_work+0x797/0xe20 worker_thread+0x8c9/0xfd0 kthread+0x232/0x2b0 ret_from_fork+0x1f/0x30