INFO: task kworker/u8:2:16368 blocked for more than 143 seconds.
Not tainted 6.12.0-syzkaller-03657-g43fb83c17ba2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:2 state:D stack:24064 pid:16368 tgid:16368 ppid:2 flags:0x00004000
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
context_switch kernel/sched/core.c:5369 [inline]
__schedule+0xe5a/0x5ae0 kernel/sched/core.c:6756
__schedule_loop kernel/sched/core.c:6833 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6848
io_schedule+0xbf/0x130 kernel/sched/core.c:7681
folio_wait_bit_common+0x3d8/0x9b0 mm/filemap.c:1309
folio_lock include/linux/pagemap.h:1148 [inline]
mpage_prepare_extent_to_map+0xa16/0x1470 fs/ext4/inode.c:2480
ext4_do_writepages+0x974/0x32f0 fs/ext4/inode.c:2688
ext4_writepages+0x303/0x730 fs/ext4/inode.c:2824
do_writepages+0x1b3/0x820 mm/page-writeback.c:2683
__writeback_single_inode+0x166/0xfa0 fs/fs-writeback.c:1680
writeback_sb_inodes+0x603/0xfa0 fs/fs-writeback.c:1976
__writeback_inodes_wb+0xff/0x2e0 fs/fs-writeback.c:2047
wb_writeback+0x72d/0xb60 fs/fs-writeback.c:2158
wb_check_background_flush fs/fs-writeback.c:2228 [inline]
wb_do_writeback fs/fs-writeback.c:2316 [inline]
wb_workfn+0x741/0xbc0 fs/fs-writeback.c:2343
process_one_work+0x958/0x1b30 kernel/workqueue.c:3229
process_scheduled_works kernel/workqueue.c:3310 [inline]
worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
INFO: task syz.7.2791:29910 blocked for more than 144 seconds.
Not tainted 6.12.0-syzkaller-03657-g43fb83c17ba2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.2791 state:D stack:27024 pid:29910 tgid:29909 ppid:25999 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5369 [inline]
__schedule+0xe5a/0x5ae0 kernel/sched/core.c:6756
__schedule_loop kernel/sched/core.c:6833 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6848
io_schedule+0xbf/0x130 kernel/sched/core.c:7681
folio_wait_bit_common+0x3d8/0x9b0 mm/filemap.c:1309
folio_wait_writeback+0x3c/0x90 mm/page-writeback.c:3189
mpage_prepare_extent_to_map+0x533/0x1470 fs/ext4/inode.c:2496
ext4_do_writepages+0x974/0x32f0 fs/ext4/inode.c:2688
ext4_writepages+0x303/0x730 fs/ext4/inode.c:2824
do_writepages+0x1b3/0x820 mm/page-writeback.c:2683
filemap_fdatawrite_wbc mm/filemap.c:398 [inline]
filemap_fdatawrite_wbc+0x104/0x160 mm/filemap.c:388
__filemap_fdatawrite_range+0xb3/0xf0 mm/filemap.c:431
file_write_and_wait_range+0xca/0x140 mm/filemap.c:788
ext4_sync_file+0x290/0xf30 fs/ext4/fsync.c:158
vfs_fsync_range+0x136/0x220 fs/sync.c:187
__do_sys_msync+0x3c6/0x5b0 mm/msync.c:96
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6aca77e819
RSP: 002b:00007f6acb62d038 EFLAGS: 00000246 ORIG_RAX: 000000000000001a
RAX: ffffffffffffffda RBX: 00007f6aca935fa0 RCX: 00007f6aca77e819
RDX: 0000000400000004 RSI: 0080100000000002 RDI: 000000001ffff000
RBP: 00007f6aca7f175e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f6aca935fa0 R15: 00007ffeb8904d28
INFO: task syz.9.2845:30537 blocked for more than 144 seconds.
Not tainted 6.12.0-syzkaller-03657-g43fb83c17ba2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.9.2845 state:D stack:24592 pid:30537 tgid:30537 ppid:29987 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5369 [inline]
__schedule+0xe5a/0x5ae0 kernel/sched/core.c:6756
__schedule_loop kernel/sched/core.c:6833 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6848
io_schedule+0xbf/0x130 kernel/sched/core.c:7681
folio_wait_bit_common+0x3d8/0x9b0 mm/filemap.c:1309
__folio_lock mm/filemap.c:1647 [inline]
lock_folio_maybe_drop_mmap mm/filemap.c:3132 [inline]
filemap_fault+0xd7a/0x2820 mm/filemap.c:3366
__do_fault+0x10a/0x490 mm/memory.c:4882
do_read_fault mm/memory.c:5297 [inline]
do_fault mm/memory.c:5431 [inline]
do_pte_missing+0xec5/0x3e70 mm/memory.c:3965
handle_pte_fault mm/memory.c:5766 [inline]
__handle_mm_fault+0x100a/0x2a10 mm/memory.c:5909
handle_mm_fault+0x3fa/0xaa0 mm/memory.c:6077
faultin_page mm/gup.c:1187 [inline]
__get_user_pages+0x8d9/0x3b50 mm/gup.c:1485
__get_user_pages_locked mm/gup.c:1751 [inline]
get_dump_page+0xfb/0x220 mm/gup.c:2269
dump_user_range+0x135/0x8c0 fs/coredump.c:943
elf_core_dump+0x2766/0x3840 fs/binfmt_elf.c:2127
do_coredump+0x2c42/0x4160 fs/coredump.c:758
get_signal+0x23f3/0x2610 kernel/signal.c:3001
arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
irqentry_exit_to_user_mode+0x13f/0x280 kernel/entry/common.c:231
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x401000
RSP: 002b:000000000000000f EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00007f410b336080 RCX: 00007f410b17e819
RDX: ffffffffffffffff RSI: 0000000000000007 RDI: 00000400000000d0
RBP: 00007f410b1f175e R08: 0000000000000009 R09: 0000000000000000
R10: ffffffffff600000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f410b336080 R15: 00007fff3caa8d58
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8ddba680 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8ddba680 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8ddba680 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6744
3 locks held by syslogd/5205:
#0: ffff8880b863ef18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:598
#1: ffff8880b8728a88 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x2c1/0x8e0 kernel/sched/psi.c:987
#2: ffffffff8ddba680 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#2: ffffffff8ddba680 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#2: ffffffff8ddba680 (rcu_read_lock){....}-{1:3}, at: filemap_get_entry+0xd0/0x3c0 mm/filemap.c:1839
2 locks held by getty/5617:
#0: ffff88814d20c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211
4 locks held by kworker/u8:2/16368:
#0: ffff888141add148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x1212/0x1b30 kernel/workqueue.c:3204
#1: ffffc90000117d80 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x8bb/0x1b30 kernel/workqueue.c:3205
#2: ffff88814e2f40e0 (&type->s_umount_key#32){++++}-{4:4}, at: super_trylock_shared+0x1e/0xf0 fs/super.c:562
#3: ffff88814e2f6b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x1b3/0x820 mm/page-writeback.c:2683
2 locks held by syz.6.2584/28066:
#0: ffff888066edcd80 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_do_close+0x26/0x90 net/bluetooth/hci_core.c:481
#1: ffff888066edc078 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x34c/0x1260 net/bluetooth/hci_sync.c:5193
1 lock held by syz.7.2791/29910:
#0: ffff88814e2f6b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x1b3/0x820 mm/page-writeback.c:2683
2 locks held by syz.9.2845/30537:
#0: ffff88806c236420 (sb_writers#5){.+.+}-{0:0}, at: get_signal+0x23f3/0x2610 kernel/signal.c:3001
#1: ffff88801cb081e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable include/linux/mmap_lock.h:153 [inline]
#1: ffff88801cb081e0 (&mm->mmap_lock){++++}-{4:4}, at: __get_user_pages_locked mm/gup.c:1726 [inline]
#1: ffff88801cb081e0 (&mm->mmap_lock){++++}-{4:4}, at: get_dump_page+0xb6/0x220 mm/gup.c:2269
1 lock held by syz.1.2855/30577:
#0: ffff88814e2f6b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x1b3/0x820 mm/page-writeback.c:2683
2 locks held by syz.4.2923/31111:
#0: ffffffff8fad1fe8 (rtnl_mutex){+.+.}-{4:4}, at: tun_detach drivers/net/tun.c:698 [inline]
#0: ffffffff8fad1fe8 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x38/0x230 drivers/net/tun.c:3517
#1: ffffffff8ddc5fb8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:329
2 locks held by syz.5.3005/31385:
#0: ffff8880357dc420 (sb_writers#5){.+.+}-{0:0}, at: get_signal+0x23f3/0x2610 kernel/signal.c:3001
#1: ffff8880423501e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable include/linux/mmap_lock.h:153 [inline]
#1: ffff8880423501e0 (&mm->mmap_lock){++++}-{4:4}, at: __get_user_pages_locked mm/gup.c:1726 [inline]
#1: ffff8880423501e0 (&mm->mmap_lock){++++}-{4:4}, at: get_dump_page+0xb6/0x220 mm/gup.c:2269
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-syzkaller-03657-g43fb83c17ba2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
watchdog+0xf0c/0x1240 kernel/hung_task.c:379
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31351 Comm: kworker/u8:11 Not tainted 6.12.0-syzkaller-03657-g43fb83c17ba2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Workqueue: events_unbound nsim_dev_trap_report_work
RIP: 0010:mark_lock+0xaa/0xc60 kernel/locking/lockdep.c:4727
Code: 00 00 31 c0 41 83 fe 09 0f 87 e3 00 00 00 41 83 fe 08 49 89 fc 48 89 f3 0f 84 97 00 00 00 41 bd 01 00 00 00 44 89 f1 41 d3 e5 <4d> 63 ed 48 89 df e8 1b 6d ff ff 48 ba 00 00 00 00 00 fc ff df 48
RSP: 0018:ffffc90005887930 EFLAGS: 00000002
RAX: 0000000000000000 RBX: ffff88806c2da8e0 RCX: 0000000000000002
RDX: dffffc0000000000 RSI: ffff88806c2da8e0 RDI: ffff88806c2d9e00
RBP: ffffc90005887a68 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff901dc557 R11: 000000000000004f R12: ffff88806c2d9e00
R13: 0000000000000004 R14: 0000000000000002 R15: 1ffff92000b10f2c
FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555f6f90e2c0 CR3: 000000000db7e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
mark_held_locks+0x9f/0xe0 kernel/locking/lockdep.c:4321
__trace_hardirqs_on_caller kernel/locking/lockdep.c:4339 [inline]
lockdep_hardirqs_on_prepare+0x137/0x420 kernel/locking/lockdep.c:4406
trace_hardirqs_on+0x36/0x40 kernel/trace/trace_preemptirq.c:61
kasan_quarantine_put+0x10a/0x240 mm/kasan/quarantine.c:234
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:2342 [inline]
slab_free mm/slub.c:4579 [inline]
kfree+0x14f/0x4b0 mm/slub.c:4727
skb_kfree_head net/core/skbuff.c:1086 [inline]
skb_free_head+0x108/0x1d0 net/core/skbuff.c:1098
skb_release_data+0x560/0x730 net/core/skbuff.c:1125
skb_release_all net/core/skbuff.c:1190 [inline]
__kfree_skb net/core/skbuff.c:1204 [inline]
consume_skb net/core/skbuff.c:1436 [inline]
consume_skb+0xbf/0x100 net/core/skbuff.c:1430
nsim_dev_trap_report drivers/net/netdevsim/dev.c:821 [inline]
nsim_dev_trap_report_work+0x878/0xc90 drivers/net/netdevsim/dev.c:851
process_one_work+0x958/0x1b30 kernel/workqueue.c:3229
process_scheduled_works kernel/workqueue.c:3310 [inline]
worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244