INFO: task syz.1.1004:9039 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.1004 state:D stack:27048 pid:9039 ppid:5789 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5393 [inline]
__schedule+0x156f/0x4720 kernel/sched/core.c:6722
schedule+0xbd/0x170 kernel/sched/core.c:6796
io_schedule+0x80/0xd0 kernel/sched/core.c:9075
bit_wait_io+0x13/0x100 kernel/sched/wait_bit.c:209
__wait_on_bit+0x9f/0x2c0 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x13c/0x190 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:101 [inline]
do_get_write_access+0x5c9/0xe00 fs/jbd2/transaction.c:1096
jbd2_journal_get_write_access+0x10c/0x140 fs/jbd2/transaction.c:1231
__ext4_journal_get_write_access+0x208/0x6d0 fs/ext4/ext4_jbd2.c:241
ext4_reserve_inode_write+0x205/0x2a0 fs/ext4/inode.c:5967
__ext4_mark_inode_dirty+0x13f/0x720 fs/ext4/inode.c:6151
ext4_dirty_inode+0xcb/0x110 fs/ext4/inode.c:6188
__mark_inode_dirty+0x2cc/0xc90 fs/fs-writeback.c:2537
generic_update_time fs/inode.c:1978 [inline]
inode_update_time fs/inode.c:1991 [inline]
__file_update_time fs/inode.c:2177 [inline]
file_update_time+0x187/0x1a0 fs/inode.c:2207
ext4_page_mkwrite+0x1f9/0x11a0 fs/ext4/inode.c:6306
do_page_mkwrite+0x153/0x3f0 mm/memory.c:2951
do_shared_fault mm/memory.c:4717 [inline]
do_fault mm/memory.c:4779 [inline]
do_pte_missing mm/memory.c:3689 [inline]
handle_pte_fault mm/memory.c:5047 [inline]
__handle_mm_fault mm/memory.c:5190 [inline]
handle_mm_fault+0x1a26/0x4a40 mm/memory.c:5355
do_user_addr_fault+0xeb7/0x13e0 arch/x86/mm/fault.c:1371
handle_page_fault arch/x86/mm/fault.c:1463 [inline]
exc_page_fault+0x64/0x100 arch/x86/mm/fault.c:1516
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7fa1e4c73ba9
RSP: 002b:00007ffdf55cb580 EFLAGS: 00010202
RAX: 0000001b2e524000 RBX: ffffffff81b641d6 RCX: 0000001b2e523ff8
RDX: 00000000003ffde8 RSI: 00000000003ffde8 RDI: 00007fa1e5b55700
RBP: 0000000000000001 R08: 0000000000000000 R09: 00007fa1e5012000
R10: 00007fa1e5b55700 R11: 0000000000000000 R12: 00007fa1e5026038
R13: 0000000000005512 R14: ffffffff81b64adc R15: 00007fa1e5b55720
INFO: task syz.4.1006:9043 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.1006 state:D stack:27048 pid:9043 ppid:7010 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5393 [inline]
__schedule+0x156f/0x4720 kernel/sched/core.c:6722
schedule+0xbd/0x170 kernel/sched/core.c:6796
io_schedule+0x80/0xd0 kernel/sched/core.c:9075
bit_wait_io+0x13/0x100 kernel/sched/wait_bit.c:209
__wait_on_bit+0x9f/0x2c0 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x13c/0x190 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:101 [inline]
do_get_write_access+0x5c9/0xe00 fs/jbd2/transaction.c:1096
jbd2_journal_get_write_access+0x10c/0x140 fs/jbd2/transaction.c:1231
__ext4_journal_get_write_access+0x208/0x6d0 fs/ext4/ext4_jbd2.c:241
ext4_reserve_inode_write+0x205/0x2a0 fs/ext4/inode.c:5967
__ext4_mark_inode_dirty+0x13f/0x720 fs/ext4/inode.c:6151
ext4_dirty_inode+0xcb/0x110 fs/ext4/inode.c:6188
__mark_inode_dirty+0x2cc/0xc90 fs/fs-writeback.c:2537
generic_update_time fs/inode.c:1978 [inline]
inode_update_time fs/inode.c:1991 [inline]
__file_update_time fs/inode.c:2177 [inline]
file_update_time+0x187/0x1a0 fs/inode.c:2207
ext4_page_mkwrite+0x1f9/0x11a0 fs/ext4/inode.c:6306
do_page_mkwrite+0x153/0x3f0 mm/memory.c:2951
do_shared_fault mm/memory.c:4717 [inline]
do_fault mm/memory.c:4779 [inline]
do_pte_missing mm/memory.c:3689 [inline]
handle_pte_fault mm/memory.c:5047 [inline]
__handle_mm_fault mm/memory.c:5190 [inline]
handle_mm_fault+0x1a26/0x4a40 mm/memory.c:5355
do_user_addr_fault+0xeb7/0x13e0 arch/x86/mm/fault.c:1371
handle_page_fault arch/x86/mm/fault.c:1463 [inline]
exc_page_fault+0x64/0x100 arch/x86/mm/fault.c:1516
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f00ba473c09
RSP: 002b:00007ffcb1db28d0 EFLAGS: 00010202
RAX: 0000001b31b24000 RBX: 0000000000000000 RCX: 00000000003ffde8
RDX: 0000001b31b23ffc RSI: 00000000003ffde8 RDI: 00007f00bb355700
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007f00ba812000
R10: 00007f00bb355700 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000fb4 R14: ffffffff813242f0 R15: 00007f00bb355720
INFO: task syz.3.1007:9045 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1007 state:D stack:27560 pid:9045 ppid:5784 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5393 [inline]
__schedule+0x156f/0x4720 kernel/sched/core.c:6722
schedule+0xbd/0x170 kernel/sched/core.c:6796
io_schedule+0x80/0xd0 kernel/sched/core.c:9075
bit_wait_io+0x13/0x100 kernel/sched/wait_bit.c:209
__wait_on_bit+0x9f/0x2c0 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x13c/0x190 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:101 [inline]
do_get_write_access+0x5c9/0xe00 fs/jbd2/transaction.c:1096
jbd2_journal_get_write_access+0x10c/0x140 fs/jbd2/transaction.c:1231
__ext4_journal_get_write_access+0x208/0x6d0 fs/ext4/ext4_jbd2.c:241
ext4_reserve_inode_write+0x205/0x2a0 fs/ext4/inode.c:5967
__ext4_mark_inode_dirty+0x13f/0x720 fs/ext4/inode.c:6151
ext4_dirty_inode+0xcb/0x110 fs/ext4/inode.c:6188
__mark_inode_dirty+0x2cc/0xc90 fs/fs-writeback.c:2537
generic_update_time fs/inode.c:1978 [inline]
inode_update_time fs/inode.c:1991 [inline]
__file_update_time fs/inode.c:2177 [inline]
file_update_time+0x187/0x1a0 fs/inode.c:2207
ext4_page_mkwrite+0x1f9/0x11a0 fs/ext4/inode.c:6306
do_page_mkwrite+0x153/0x3f0 mm/memory.c:2951
do_shared_fault mm/memory.c:4717 [inline]
do_fault mm/memory.c:4779 [inline]
do_pte_missing mm/memory.c:3689 [inline]
handle_pte_fault mm/memory.c:5047 [inline]
__handle_mm_fault mm/memory.c:5190 [inline]
handle_mm_fault+0x1a26/0x4a40 mm/memory.c:5355
do_user_addr_fault+0xeb7/0x13e0 arch/x86/mm/fault.c:1371
handle_page_fault arch/x86/mm/fault.c:1463 [inline]
exc_page_fault+0x64/0x100 arch/x86/mm/fault.c:1516
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7fc883a6cea3
RSP: 002b:00007ffc167c6540 EFLAGS: 00010246
RAX: 00000000003ffde8 RBX: 0000000000000000 RCX: 0000001b2e364000
RDX: 0000001b2e324000 RSI: 0000000000400000 RDI: 00007fc883de7708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffc167c67d0
INFO: task syz.5.1008:9046 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.1008 state:D stack:27432 pid:9046 ppid:7235 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5393 [inline]
__schedule+0x156f/0x4720 kernel/sched/core.c:6722
schedule+0xbd/0x170 kernel/sched/core.c:6796
io_schedule+0x80/0xd0 kernel/sched/core.c:9075
bit_wait_io+0x13/0x100 kernel/sched/wait_bit.c:209
__wait_on_bit+0x9f/0x2c0 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x13c/0x190 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:101 [inline]
do_get_write_access+0x5c9/0xe00 fs/jbd2/transaction.c:1096
jbd2_journal_get_write_access+0x10c/0x140 fs/jbd2/transaction.c:1231
__ext4_journal_get_write_access+0x208/0x6d0 fs/ext4/ext4_jbd2.c:241
ext4_reserve_inode_write+0x205/0x2a0 fs/ext4/inode.c:5967
__ext4_mark_inode_dirty+0x13f/0x720 fs/ext4/inode.c:6151
ext4_dirty_inode+0xcb/0x110 fs/ext4/inode.c:6188
__mark_inode_dirty+0x2cc/0xc90 fs/fs-writeback.c:2537
generic_update_time fs/inode.c:1978 [inline]
inode_update_time fs/inode.c:1991 [inline]
__file_update_time fs/inode.c:2177 [inline]
file_update_time+0x187/0x1a0 fs/inode.c:2207
ext4_page_mkwrite+0x1f9/0x11a0 fs/ext4/inode.c:6306
do_page_mkwrite+0x153/0x3f0 mm/memory.c:2951
do_shared_fault mm/memory.c:4717 [inline]
do_fault mm/memory.c:4779 [inline]
do_pte_missing mm/memory.c:3689 [inline]
handle_pte_fault mm/memory.c:5047 [inline]
__handle_mm_fault mm/memory.c:5190 [inline]
handle_mm_fault+0x1a26/0x4a40 mm/memory.c:5355
do_user_addr_fault+0xeb7/0x13e0 arch/x86/mm/fault.c:1371
handle_page_fault arch/x86/mm/fault.c:1463 [inline]
exc_page_fault+0x64/0x100 arch/x86/mm/fault.c:1516
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f04c926cea3
RSP: 002b:00007fffb7dfb590 EFLAGS: 00010246
RAX: 00000000003ffde8 RBX: 0000000000000000 RCX: 0000001b2fe64000
RDX: 0000001b2fe24000 RSI: 0000000000400000 RDI: 00007f04c95e7708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007fffb7dfb820
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8e1322e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8e1322e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8e1322e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6669
6 locks held by kworker/u4:8/3468:
#0: ffff888020665d38 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2632 [inline]
#0: ffff888020665d38 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x975/0x1600 kernel/workqueue.c:2734
#1: ffffc9000cc87d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2632 [inline]
#1: ffffc9000cc87d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x975/0x1600 kernel/workqueue.c:2734
#2: ffff88814ce2c0e0 (&type->s_umount_key#31){++++}-{3:3}, at: super_trylock_shared+0x20/0xf0 fs/super.c:604
#3: ffff88814ce2ec58 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1770 [inline]
#3: ffff88814ce2ec58 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1a4/0x350 fs/ext4/inode.c:2821
#4: ffff88814ce30990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1f3f/0x2170 fs/jbd2/transaction.c:448
#5: ffff8880776c9688 (&ei->i_data_sem){++++}-{3:3}, at: ext4_map_blocks+0x918/0x1a90 fs/ext4/inode.c:647
2 locks held by getty/5542:
#0: ffff888033cf20a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900032862f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x43a/0x1400 drivers/tty/n_tty.c:2217
3 locks held by syz-executor/5773:
#0: ffff8880322c8b20 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline]
#0: ffff8880322c8b20 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5382 [inline]
#0: ffff8880322c8b20 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:5442
#1: ffff88814ce2c510 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1634 [inline]
#1: ffff88814ce2c510 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:1738 [inline]
#1: ffff88814ce2c510 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1e2/0x11a0 fs/ext4/inode.c:6305
#2: ffff88814ce30990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1f3f/0x2170 fs/jbd2/transaction.c:448
3 locks held by syz.1.1004/9039:
#0: ffff888022311e20 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline]
#0: ffff888022311e20 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5382 [inline]
#0: ffff888022311e20 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:5442
#1: ffff88814ce2c510 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1634 [inline]
#1: ffff88814ce2c510 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:1738 [inline]
#1: ffff88814ce2c510 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1e2/0x11a0 fs/ext4/inode.c:6305
#2: ffff88814ce30990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1f3f/0x2170 fs/jbd2/transaction.c:448
3 locks held by syz.4.1006/9043:
#0: ffff888022313aa0 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline]
#0: ffff888022313aa0 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5382 [inline]
#0: ffff888022313aa0 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:5442
#1: ffff88814ce2c510 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1634 [inline]
#1: ffff88814ce2c510 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:1738 [inline]
#1: ffff88814ce2c510 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1e2/0x11a0 fs/ext4/inode.c:6305
#2: ffff88814ce30990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1f3f/0x2170 fs/jbd2/transaction.c:448
3 locks held by syz.3.1007/9045:
#0: ffff888022314420 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline]
#0: ffff888022314420 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5382 [inline]
#0: ffff888022314420 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:5442
#1: ffff88814ce2c510 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1634 [inline]
#1: ffff88814ce2c510 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:1738 [inline]
#1: ffff88814ce2c510 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1e2/0x11a0 fs/ext4/inode.c:6305
#2: ffff88814ce30990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1f3f/0x2170 fs/jbd2/transaction.c:448
3 locks held by syz.5.1008/9046:
#0: ffff888022315720 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline]
#0: ffff888022315720 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5382 [inline]
#0: ffff888022315720 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:5442
#1: ffff88814ce2c510 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1634 [inline]
#1: ffff88814ce2c510 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:1738 [inline]
#1: ffff88814ce2c510 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1e2/0x11a0 fs/ext4/inode.c:6305
#2: ffff88814ce30990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1f3f/0x2170 fs/jbd2/transaction.c:448
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Call Trace:
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
nmi_cpu_backtrace+0x3a6/0x3e0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x2f0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xf59/0xfa0 kernel/hung_task.c:379
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293