INFO: task syz-executor:4251 blocked for more than 143 seconds.
Not tainted 6.1.119-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:20320 pid:4251 ppid:1 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5241 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6558
schedule+0xbf/0x180 kernel/sched/core.c:6634
rwsem_down_write_slowpath+0xea1/0x14b0 kernel/locking/rwsem.c:1189
deactivate_super+0xa9/0xe0 fs/super.c:362
cleanup_mnt+0x490/0x520 fs/namespace.c:1186
task_work_run+0x246/0x300 kernel/task_work.c:203
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303
do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f7ec2387047
RSP: 002b:00007ffeaa99a7b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f7ec240180c RCX: 00007f7ec2387047
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffeaa99a870
RBP: 00007ffeaa99a870 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffeaa99b8f0
R13: 00007f7ec240180c R14: 00007ffeaa99b930 R15: 00000000000000a6
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8d32b110 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8d32b910 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:517
1 lock held by khungtaskd/27:
#0: ffffffff8d32af40 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#0: ffffffff8d32af40 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#0: ffffffff8d32af40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6510
2 locks held by getty/4010:
#0: ffff88814ddc8098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc9000325e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a7/0x1db0 drivers/tty/n_tty.c:2198
1 lock held by syz-executor/4251:
#0: ffff888073de40e0 (&type->s_umount_key#32){++++}-{3:3}, at: deactivate_super+0xa9/0xe0 fs/super.c:362
2 locks held by kworker/0:6/4300:
#0: ffff888017c70938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
#1: ffffc90004c7fd20 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
3 locks held by kworker/0:7/4329:
#0: ffff888017c70938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
#1: ffffc90004cbfd20 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
#2: ffffffff8d330538 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:323 [inline]
#2: ffffffff8d330538 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x360/0x930 kernel/rcu/tree_exp.h:962
2 locks held by kworker/0:14/6653:
#0: ffff888017c72138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
#1: ffffc9000567fd20 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
3 locks held by ext4lazyinit/6938:
4 locks held by syz.4.1216/8418:
#0: ffff8880738481c0 (&tty->legacy_mutex){+.+.}-{3:3}, at: tty_set_ldisc+0x4e/0x560 drivers/tty/tty_ldisc.c:529
#1: ffff888073848098 (&tty->ldisc_sem){++++}-{0:0}, at: __tty_ldisc_lock drivers/tty/tty_ldisc.c:290 [inline]
#1: ffff888073848098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_lock+0x68/0xb0 drivers/tty/tty_ldisc.c:314
#2: ffffffff8e50a768 (rtnl_mutex){+.+.}-{3:3}, at: unregister_netdev+0x79/0x210 net/core/dev.c:10948
#3: ffffffff8d330538 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:323 [inline]
#3: ffffffff8d330538 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x360/0x930 kernel/rcu/tree_exp.h:962
1 lock held by syz.6.1217/8433:
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 6.1.119-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
nmi_cpu_backtrace+0x4e1/0x560 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1ae/0x3f0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
watchdog+0xf88/0xfd0 kernel/hung_task.c:377
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 8433 Comm: syz.6.1217 Not tainted 6.1.119-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:zswap_frontswap_store+0x584/0x1670 mm/zswap.c:1179
Code: e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 05 e8 cf ff 06 00 4b 8b 5c 2c 18 48 89 df 4c 89 fe e8 7f 78 af ff 4c 39 fb <48> 8b 5c 24 48 0f 85 5a 02 00 00 bf 00 02 00 00 48 8b 74 24 28 e8
RSP: 0018:ffffc9000c52eb40 EFLAGS: 00000246
RAX: 0000000000000002 RBX: 0000000000000000 RCX: ffff88801d368000
RDX: ffffc9001507b000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000c52ed00 R08: ffffffff81db2551 R09: ffff88804c1ffa20
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888071267000
R13: 0000000000000e20 R14: ffffea0001c499c0 R15: 0000000000000000
FS: 00007f61372386c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c27a1ba CR3: 000000005805c000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__frontswap_store+0x2cf/0x570 mm/frontswap.c:186
frontswap_store include/linux/frontswap.h:66 [inline]
swap_writepage+0xca/0x1a0 mm/page_io.c:200
pageout mm/vmscan.c:1280 [inline]
shrink_folio_list+0x36e4/0x8f40 mm/vmscan.c:1943
reclaim_folio_list+0x135/0x410 mm/vmscan.c:2688
reclaim_pages+0x5b8/0x720 mm/vmscan.c:2724
madvise_cold_or_pageout_pte_range+0x1ddc/0x2960 mm/madvise.c:494
walk_pmd_range mm/pagewalk.c:128 [inline]
walk_pud_range mm/pagewalk.c:205 [inline]
walk_p4d_range mm/pagewalk.c:240 [inline]
walk_pgd_range+0xb28/0x13d0 mm/pagewalk.c:277
__walk_page_range+0x137/0x5c0 mm/pagewalk.c:379
walk_page_range+0x4ef/0x6d0 mm/pagewalk.c:477
madvise_pageout_page_range mm/madvise.c:552 [inline]
madvise_pageout mm/madvise.c:589 [inline]
madvise_vma_behavior mm/madvise.c:1021 [inline]
madvise_walk_vmas mm/madvise.c:1250 [inline]
do_madvise+0x2b12/0x4470 mm/madvise.c:1429
__do_sys_madvise mm/madvise.c:1442 [inline]
__se_sys_madvise mm/madvise.c:1440 [inline]
__x64_sys_madvise+0xa1/0xb0 mm/madvise.c:1440
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f6136385d19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6137238038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f6136576080 RCX: 00007f6136385d19
RDX: 0000000000000015 RSI: 0000000000600000 RDI: 0000000020000000
RBP: 00007f6136401a20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f6136576080 R15: 00007fff941f0408