INFO: task syz.9.2857:16327 blocked in I/O wait for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.9.2857      state:D stack:25648 pid:16327 tgid:16326 ppid:13005  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x125c/0x6730 kernel/sched/core.c:7234
 __schedule_loop kernel/sched/core.c:7311 [inline]
 schedule+0xdd/0x2c0 kernel/sched/core.c:7326
 io_schedule+0x8a/0xf0 kernel/sched/core.c:8154
 folio_wait_bit_common+0x414/0xa70 mm/filemap.c:1323
 folio_lock include/linux/pagemap.h:1157 [inline]
 migrate_folio_unmap mm/migrate.c:1250 [inline]
 migrate_pages_batch+0x7a1/0x45c0 mm/migrate.c:1907
 migrate_pages_sync+0x4db/0x880 mm/migrate.c:2051
 migrate_pages+0x1a83/0x2850 mm/migrate.c:2133
 compact_zone+0x243c/0x4420 mm/compaction.c:2669
 compact_node+0x17f/0x2c0 mm/compaction.c:2938
 compact_nodes mm/compaction.c:2960 [inline]
 sysctl_compaction_handler mm/compaction.c:3011 [inline]
 sysctl_compaction_handler+0x141/0x210 mm/compaction.c:2998
 proc_sys_call_handler+0x47f/0x5a0 fs/proc/proc_sysctl.c:600
 iter_file_splice_write+0x830/0x10b0 fs/splice.c:736
 do_splice_from fs/splice.c:936 [inline]
 direct_splice_actor+0x192/0x690 fs/splice.c:1159
 splice_direct_to_actor+0x345/0xa30 fs/splice.c:1103
 do_splice_direct_actor fs/splice.c:1202 [inline]
 do_splice_direct+0x174/0x240 fs/splice.c:1228
 do_sendfile+0xadc/0xe20 fs/read_write.c:1371
 __do_sys_sendfile64 fs/read_write.c:1426 [inline]
 __se_sys_sendfile64 fs/read_write.c:1418 [inline]
 __x64_sys_sendfile64+0x154/0x220 fs/read_write.c:1418
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffb83d9ce59
RSP: 002b:00007ffb84c51028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007ffb84015fa0 RCX: 00007ffb83d9ce59
RDX: 00002000000000c0 RSI: 0000000000000003 RDI: 0000000000000004
RBP: 00007ffb83e32e6f R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000000a R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffb84016038 R14: 00007ffb84015fa0 R15: 00007ffca2de1e98
 </TASK>

Showing all locks held in the system:
2 locks held by rcu_exp_gp_kthr/18:
 #0: ffff88806a63b520 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2c/0x140 kernel/sched/core.c:667
 #1: ffff88806a624568 (psi_seq){-.-.}-{0:0}, at: psi_sched_switch kernel/sched/stats.h:218 [inline]
 #1: ffff88806a624568 (psi_seq){-.-.}-{0:0}, at: __schedule+0x2e8e/0x6730 kernel/sched/core.c:7228
1 lock held by khungtaskd/43:
 #0: ffffffff8e9e60c0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #0: ffffffff8e9e60c0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #0: ffffffff8e9e60c0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6775
2 locks held by kworker/u35:0/65:
 #0: ffff888028a7f140 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: process_one_work+0x12b1/0x1940 kernel/workqueue.c:3297
 #1: ffffc90000d37d08 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work+0x988/0x1940 kernel/workqueue.c:3298
2 locks held by getty/5533:
 #0: ffff88802c03f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc900033832e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x419/0x14e0 drivers/tty/n_tty.c:2211
4 locks held by sshd-session/5647:
3 locks held by kworker/0:3/5732:
 #0: ffff88801bcaa940 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x12b1/0x1940 kernel/workqueue.c:3297
 #1: ffffc9000378fd08 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work+0x988/0x1940 kernel/workqueue.c:3298
 #2: ffff888027387250 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x1b8/0x6310 drivers/net/netdevsim/fib.c:1490
1 lock held by udevd/6185:
 #0: ffff888028b08350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x41a/0xe40 block/bdev.c:948
2 locks held by kworker/u35:1/9007:
 #0: ffff888028a7f140 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: process_one_work+0x12b1/0x1940 kernel/workqueue.c:3297
 #1: ffffc90003b8fd08 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work+0x988/0x1940 kernel/workqueue.c:3298
2 locks held by kworker/u35:3/12816:
 #0: ffff888028a7f140 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: process_one_work+0x12b1/0x1940 kernel/workqueue.c:3297
 #1: ffffc900047a7d08 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work+0x988/0x1940 kernel/workqueue.c:3298
2 locks held by kworker/u35:5/12818:
 #0: ffff888028a7f140 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: process_one_work+0x12b1/0x1940 kernel/workqueue.c:3297
 #1: ffffc9000397fd08 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work+0x988/0x1940 kernel/workqueue.c:3298
2 locks held by kworker/u33:59/14233:
 #0: ffff888024e70140 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work+0x12b1/0x1940 kernel/workqueue.c:3297
 #1: ffffc9000367fd08 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x988/0x1940 kernel/workqueue.c:3298
1 lock held by syz.9.2857/16327:
 #0: ffff8880603e2450 (sb_writers#3){.+.+}-{0:0}, at: splice_direct_to_actor+0x345/0xa30 fs/splice.c:1103
1 lock held by syz-executor/17857:
 #0: ffffffff8e9f1b68 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x19e/0x3c0 kernel/rcu/tree_exp.h:343
2 locks held by syz.6.4227/21216:
 #0: ffff88803ae680d8 (&type->s_umount_key#80/1){+.+.}-{4:4}, at: alloc_super fs/super.c:345 [inline]
 #0: ffff88803ae680d8 (&type->s_umount_key#80/1){+.+.}-{4:4}, at: sget_fc+0x3c8/0x1d80 fs/super.c:766
 #1: ffff888028b08350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xa2/0xe40 block/bdev.c:948
1 lock held by syz-executor/21818:
 #0: ffffffff8e9f1b68 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x19e/0x3c0 kernel/rcu/tree_exp.h:343

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

NMI backtrace for cpu 2
CPU: 2 UID: 0 PID: 43 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:122
 nmi_trigger_cpumask_backtrace+0x21c/0x2a0 lib/nmi_backtrace.c:65
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 __sys_info lib/sys_info.c:157 [inline]
 sys_info+0x141/0x190 lib/sys_info.c:165
 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
 watchdog+0xcb1/0x1030 kernel/hung_task.c:561
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 2 to CPUs 0-1,3:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5647 Comm: sshd-session Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x17/0x70 kernel/kcov.c:217
Code: 02 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 65 8b 05 05 80 2a 12 48 8b 34 24 65 48 8b 15 e1 7f 2a 12 <a9> 00 01 ff 00 74 1b f6 c4 01 74 07 a9 00 00 ff 00 74 05 e9 11 91
RSP: 0000:ffffc9000547f0c0 EFLAGS: 00000202
RAX: 0000000080000201 RBX: ffffc9000547f2c8 RCX: ffffffff850c503f
RDX: ffff88802b794a80 RSI: ffffffff850c504d RDI: ffff88802b794a80
RBP: 00000000000000c8 R08: 0000000000000006 R09: 00000000000000a8
R10: 00000000000000c8 R11: 0000000000000000 R12: 00000000000000a8
R13: 0000000000000008 R14: 00000000000000a0 R15: 0000000000000000
FS:  00007fc197943300(0000) GS:ffff8880d60e0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc196b4b000 CR3: 0000000029fd7000 CR4: 0000000000352ef0
DR0: 000004000002002c DR1: fffeffffff7fff00 DR2: 0000000080000006
DR3: 0000000000000005 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __do_index+0x14d/0x570 lib/842/842_decompress.c:196
 do_index lib/842/842_decompress.c:220 [inline]
 do_op lib/842/842_decompress.c:243 [inline]
 sw842_decompress+0xa69/0xc90 lib/842/842_decompress.c:367
 crypto_scomp_decompress include/crypto/internal/scompress.h:80 [inline]
 scomp_acomp_comp_decomp+0x732/0xc40 crypto/scompress.c:252
 crypto_acomp_decompress+0x14c/0x540 crypto/acompress.c:297
 zswap_decompress+0x4c7/0x810 mm/zswap.c:952
 zswap_load+0x25e/0x7c0 mm/zswap.c:1609
 swap_read_folio+0xab7/0x2ec0 mm/page_io.c:689
 swap_cache_read_folio+0xae/0x140 mm/swap_state.c:652
 swap_cluster_readahead+0x387/0x5f0 mm/swap_state.c:831
 swapin_readahead+0x159/0x1200 mm/swap_state.c:984
 do_swap_page+0xf98/0x5780 mm/memory.c:4836
 handle_pte_fault mm/memory.c:6382 [inline]
 __handle_mm_fault+0x192f/0x2a00 mm/memory.c:6517
 handle_mm_fault+0x37b/0xa30 mm/memory.c:6686
 do_user_addr_fault+0x5a3/0x12f0 arch/x86/mm/fault.c:1343
 handle_page_fault arch/x86/mm/fault.c:1483 [inline]
 exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1536
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7fc19734f0d3
Code: 01 62 e1 fe 28 7f 41 01 62 e1 fe 28 7f 41 02 62 e1 fe 28 7f 41 03 c3 48 3b 15 29 92 07 00 73 5f 40 0f b6 c6 48 89 d1 48 89 fa <f3> aa 48 89 d0 c3 83 fa 10 7d 22 62 e1 fd 08 7e c1 83 fa 08 7d 27
RSP: 002b:00007ffdb7786858 EFLAGS: 00010287
RAX: 0000000000000000 RBX: 00007fc196871010 RCX: 0000000000016010
RDX: 00007fc196871010 RSI: 0000000000000000 RDI: 00007fc196b4b000
RBP: 000055b6d51bd6e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000055b6d51c0360
R13: 000055b6c9efbb12 R14: 000055b6d51c3300 R15: 000055b6d51bd6e0
 </TASK>
NMI backtrace for cpu 3
CPU: 3 UID: 0 PID: 21182 Comm: syz.4.4214 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:constant_test_bit arch/x86/include/asm/bitops.h:202 [inline]
RIP: 0010:arch_test_bit arch/x86/include/asm/bitops.h:232 [inline]
RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline]
RIP: 0010:folio_test_unevictable include/linux/page-flags.h:637 [inline]
RIP: 0010:folio_lru_list include/linux/mm_inline.h:88 [inline]
RIP: 0010:lruvec_del_folio include/linux/mm_inline.h:381 [inline]
RIP: 0010:__page_cache_release.part.0+0x244/0x1440 mm/swap.c:78
Code: 0c 00 00 e8 ce 6c bd ff be 08 00 00 00 48 89 df e8 51 e5 2d 00 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 <0f> 85 45 0f 00 00 4c 8b 2b 31 ff 49 c1 ed 12 41 83 e5 01 44 89 ee
RSP: 0018:ffffc900054def48 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffffea0001717540 RCX: ffffffff824c135f
RDX: 1ffffd40002e2ea8 RSI: 0000000000000008 RDI: ffffea0001717540
RBP: ffff888058242988 R08: 0000000000000000 R09: fffff940002e2ea8
R10: ffffea0001717547 R11: 0000000000000000 R12: ffffea0001717548
R13: 0000000000000000 R14: ffff88805a836d80 R15: 00000000000000ff
FS:  0000000000000000(0000) GS:ffff8880d63e0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc448347e20 CR3: 000000000e792000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __page_cache_release mm/swap.c:1052 [inline]
 folios_put_refs+0x70b/0xaa0 mm/swap.c:1042
 folio_batch_release include/linux/folio_batch.h:101 [inline]
 shmem_undo_range+0x5e5/0x1570 mm/shmem.c:1149
 shmem_truncate_range mm/shmem.c:1277 [inline]
 shmem_evict_inode+0x3a5/0xbe0 mm/shmem.c:1407
 evict+0x3c2/0xad0 fs/inode.c:825
 iput_final fs/inode.c:2019 [inline]
 iput.part.0+0x989/0x1050 fs/inode.c:2068
 iput+0x35/0x40 fs/inode.c:2034
 dentry_unlink_inode+0x284/0x470 fs/dcache.c:479
 dentry_kill+0x25d/0xc20 fs/dcache.c:826
 shrink_kill fs/dcache.c:1275 [inline]
 shrink_dentry_list+0x1e8/0x310 fs/dcache.c:1292
 shrink_dcache_tree+0x201/0x400 fs/dcache.c:1759
 do_one_tree fs/dcache.c:1795 [inline]
 shrink_dcache_for_umount+0x101/0x6c0 fs/dcache.c:1812
 generic_shutdown_super+0x7e/0x360 fs/super.c:625
 kill_anon_super+0x3a/0x60 fs/super.c:1232
 deactivate_locked_super+0xc1/0x1b0 fs/super.c:477
 deactivate_super fs/super.c:510 [inline]
 deactivate_super+0xe7/0x110 fs/super.c:506
 cleanup_mnt+0x21f/0x450 fs/namespace.c:1317
 task_work_run+0x150/0x240 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x951/0x2ae0 kernel/exit.c:1004
 do_group_exit+0xd5/0x2a0 kernel/exit.c:1147
 get_signal+0x1ec7/0x21e0 kernel/signal.c:3038
 arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
 exit_to_user_mode_loop+0x139/0x6f0 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x666/0x870 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa95315d68e
Code: Unable to access opcode bytes at 0x7fa95315d664.
RSP: 002b:00007fa9540eff58 EFLAGS: 00000246 ORIG_RAX: 00000000000000e6
RAX: fffffffffffffdfc RBX: 00007fa9540f06c0 RCX: 00007fa95315d68e
RDX: 00007fa9540effb0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fa953232e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa953416038 R14: 00007fa953415fa0 R15: 00007ffc2c95a298
 </TASK>
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 21987 Comm: syz.7.4447 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:memset_orig+0x33/0xb0 arch/x86/lib/memset_64.S:69
Code: 01 01 01 01 01 01 01 01 48 0f af c1 41 89 f9 41 83 e1 07 75 74 48 89 d1 48 c1 e9 06 74 39 66 0f 1f 84 00 00 00 00 00 48 ff c9 <48> 89 07 48 89 47 08 48 89 47 10 48 89 47 18 48 89 47 20 48 89 47
RSP: 0000:ffffc90004377990 EFLAGS: 00000206
RAX: f8f8f8f8f8f8f8f8 RBX: ffff888027f1a880 RCX: 0000000000001912
RDX: 0000000000080000 RSI: 00000000000000f8 RDI: fffff52006d1cd40
RBP: ffff888035c0d4e0 R08: 0000000000000006 R09: 0000000000000000
R10: fffff52006d01200 R11: 0000000000000000 R12: 0000000000000000
R13: ffff888027f1a888 R14: 0000000000400000 R15: 0000000000400000
FS:  0000000000000000(0000) GS:ffff8880d61e0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc196b17000 CR3: 0000000029fd7000 CR4: 0000000000352ef0
DR0: 000004000002002c DR1: fffeffffff7fff00 DR2: 0000000080000006
DR3: 0000000000000005 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kasan_poison_vmalloc include/linux/kasan.h:631 [inline]
 remove_vm_area+0x231/0x390 mm/vmalloc.c:3332
 vfree mm/vmalloc.c:3478 [inline]
 vfree+0x6d/0x750 mm/vmalloc.c:3462
 kcov_put kernel/kcov.c:447 [inline]
 kcov_put kernel/kcov.c:443 [inline]
 kcov_close+0x34/0x60 kernel/kcov.c:554
 __fput+0x3ff/0xb50 fs/file_table.c:512
 task_work_run+0x150/0x240 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x951/0x2ae0 kernel/exit.c:1004
 do_group_exit+0xd5/0x2a0 kernel/exit.c:1147
 get_signal+0x1ec7/0x21e0 kernel/signal.c:3038
 arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
 exit_to_user_mode_loop+0x139/0x6f0 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x666/0x870 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f040e79ce59
Code: Unable to access opcode bytes at 0x7f040e79ce2f.
RSP: 002b:00007fffad06bac8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f040ea17da0 RCX: 00007f040e79ce59
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f040ea17da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f040ea17cb0 R11: 0000000000000246 R12: 000000000006a492
R13: 00007f040ea1609c R14: 000000000006a1db R15: 00007f040ea16090
 </TASK>