ci starts bisection 2023-07-02 14:11:31.812174181 +0000 UTC m=+67308.791885670
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: 7f24180e5ae1716d9e6e35b7dd3f5abdba5cb10d3790e865f5c231ffa32563cd
all runs: crashed: INFO: task hung in blkdev_put
testing current HEAD 995b406c7e972fab181a4bb57f3b95e59b8e5bf3
testing commit 995b406c7e972fab181a4bb57f3b95e59b8e5bf3 gcc
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 862a925c7363f2c0523579022c4df1cf0b0241554d958883da77b353d4ae5c52
all runs: crashed: INFO: task hung in blkdev_put
crash still not fixed/happens on the oldest tested release
revisions tested: 2, total time: 30m45.382028187s (build: 18m3.054602684s, test: 11m40.670434186s)
crash still not fixed on HEAD or HEAD had kernel test errors
commit msg: Merge tag 'csky-for-linus-6.5' of https://github.com/c-sky/csky-linux
crash: INFO: task hung in blkdev_put
INFO: task syz-executor.0:5398 blocked for more than 143 seconds.
      Not tainted 6.4.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:26744 pid:5398  ppid:5328   flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1851/0x48b0
 schedule+0xc3/0x180
 schedule_preempt_disabled+0x13/0x20
 __mutex_lock_common+0xe33/0x2530
 mutex_lock_nested+0x1b/0x20
 blkdev_put+0xe5/0x620
 blkdev_release+0x81/0x90
 __fput+0x31e/0x770
 task_work_run+0x20a/0x290
 exit_to_user_mode_loop+0xd9/0x100
 exit_to_user_mode_prepare+0xb1/0x140
 syscall_exit_to_user_mode+0x64/0x280
 do_syscall_64+0x4d/0xc0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fbba3e8c0c9
RSP: 002b:00007fbba4b2b168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007fbba3fabf80 RCX: 00007fbba3e8c0c9
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003
RBP: 00007fbba3ee7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcbd6f68ef R14: 00007fbba4b2b300 R15: 0000000000022000
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/13:
 #0: ffffffff8bf17fd0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20
1 lock held by rcu_tasks_trace/14:
 #0: ffffffff8bf18390 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20
1 lock held by khungtaskd/28:
 #0: ffffffff8bf17e00 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/4728:
 #0: ffff88814ae48098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x20/0x60
 #1: ffffc900015902f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x5f3/0x1890
1 lock held by udevd/5326:
 #0: ffff88801d23a4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0xe0/0x4e0
1 lock held by syz-executor.0/5398:
 #0: ffff88801d23a4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe5/0x620
1 lock held by syz-executor.0/5705:
 #0: ffff88801d23a4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0xe0/0x4e0
1 lock held by syz-executor.0/5721:
 #0: ffff88801d23a4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0xe0/0x4e0

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Call Trace:
 <TASK>
 dump_stack_lvl+0x167/0x220
 nmi_cpu_backtrace+0x34f/0x380
 nmi_trigger_cpumask_backtrace+0x103/0x1f0
 watchdog+0xa7c/0xac0
 kthread+0x276/0x2f0
 ret_from_fork+0x1f/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4992 Comm: kworker/0:5 Not tainted 6.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Workqueue: events cfg80211_wiphy_work
RIP: 0010:ieee80211_inform_bss+0x66f/0xf00
Code: e8 06 d5 90 f8 48 8b 4c 24 18 4c 8b 23 4d 85 e4 74 43 48 8b 44 24 20 48 8d 98 17 02 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 28 <84> c0 0f 85 83 06 00 00 80 3b 07 75 1e 49 8d 5c 24 05 48 89 d8 48
RSP: 0018:ffffc900036bf2c0 EFLAGS: 00000a07
RAX: 0000000000000000 RBX: ffff8880760fea17 RCX: ffffc900036bf7a8
RDX: 0000000000000004 RSI: ffff88802043d5b8 RDI: ffff88801becf8da
RBP: ffffc900036bf3f8 R08: 000000006c604830 R09: 1ffff110037d9f1b
R10: dffffc0000000000 R11: ffffed10037d9f1c R12: ffff88802043d5be
R13: dffffc0000000000 R14: ffff8880760fe878 R15: 1ffff1100ec1fd0f
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005652d129d680 CR3: 000000000bd26000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 rdev_inform_bss+0xc1/0x2b0
 cfg80211_inform_bss_frame_data+0xb96/0x13f0
 ieee80211_bss_info_update+0x694/0x9e0
 ieee80211_ibss_rx_queued_mgmt+0x1181/0x25a0
 ieee80211_iface_work+0x596/0x9c0
 cfg80211_wiphy_work+0x1dc/0x220
 process_one_work+0x826/0xfb0
 worker_thread+0x8c9/0xfd0
 kthread+0x276/0x2f0
 ret_from_fork+0x1f/0x30
 </TASK>