INFO: task syz-executor:4261 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:21824 pid:4261  ppid:4260   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5257 [inline]
 __schedule+0x1089/0x4140 kernel/sched/core.c:6584
 schedule+0xb9/0x180 kernel/sched/core.c:6660
 io_schedule+0x7c/0xd0 kernel/sched/core.c:8848
 bit_wait_io+0xf/0x100 kernel/sched/wait_bit.c:209
 __wait_on_bit+0x9b/0x2c0 kernel/sched/wait_bit.c:49
 out_of_line_wait_on_bit+0x138/0x190 kernel/sched/wait_bit.c:64
 wait_on_bit_io include/linux/wait_bit.h:101 [inline]
 do_get_write_access+0x605/0xf20 fs/jbd2/transaction.c:1115
 jbd2_journal_get_write_access+0x108/0x140 fs/jbd2/transaction.c:1250
 __ext4_journal_get_write_access+0x24b/0x6e0 fs/ext4/ext4_jbd2.c:235
 ext4_reserve_inode_write+0x201/0x290 fs/ext4/inode.c:5978
 __ext4_mark_inode_dirty+0x161/0x7b0 fs/ext4/inode.c:6162
 ext4_dirty_inode+0xbf/0x100 fs/ext4/inode.c:6199
 __mark_inode_dirty+0x2e7/0xe80 fs/fs-writeback.c:2515
 generic_update_time fs/inode.c:1944 [inline]
 inode_update_time fs/inode.c:1957 [inline]
 __file_update_time+0x21d/0x240 fs/inode.c:2145
 file_update_time+0x2f3/0x370 fs/inode.c:2176
 ext4_page_mkwrite+0x1a9/0x10d0 fs/ext4/inode.c:6317
 do_page_mkwrite+0x16b/0x5c0 mm/memory.c:3009
 wp_page_shared+0x167/0x370 mm/memory.c:3358
 handle_pte_fault mm/memory.c:5047 [inline]
 __handle_mm_fault mm/memory.c:5171 [inline]
 handle_mm_fault+0x1b1b/0x3d40 mm/memory.c:5292
 do_user_addr_fault+0x5a9/0xbb0 arch/x86/mm/fault.c:1338
 handle_page_fault arch/x86/mm/fault.c:1429 [inline]
 exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1482
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f63a6c7df91
RSP: 002b:00007ffdf6211fe0 EFLAGS: 00010202
RAX: 0000000000000020 RBX: 0000000000000001 RCX: 0000000000000005
RDX: 00007f63a4ab4000 RSI: 00000000000027a1 RDI: ffffffff878fffff
RBP: 00007ffdf62124e0 R08: 0000000000001000 R09: 000055558d860418
R10: 000000000000008f R11: 000055558d860418 R12: 00007ffdf6212320
R13: 00007ffdf6212110 R14: 585858582e7a7973 R15: 00007ffdf6212060
 </TASK>
INFO: task syz.2.1861:9289 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.1861      state:D stack:25360 pid:9289  ppid:4283   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5257 [inline]
 __schedule+0x1089/0x4140 kernel/sched/core.c:6584
 schedule+0xb9/0x180 kernel/sched/core.c:6660
 io_schedule+0x7c/0xd0 kernel/sched/core.c:8848
 bit_wait_io+0xf/0x100 kernel/sched/wait_bit.c:209
 __wait_on_bit+0x9b/0x2c0 kernel/sched/wait_bit.c:49
 out_of_line_wait_on_bit+0x138/0x190 kernel/sched/wait_bit.c:64
 wait_on_bit_io include/linux/wait_bit.h:101 [inline]
 do_get_write_access+0x605/0xf20 fs/jbd2/transaction.c:1115
 jbd2_journal_get_write_access+0x108/0x140 fs/jbd2/transaction.c:1250
 __ext4_journal_get_write_access+0x24b/0x6e0 fs/ext4/ext4_jbd2.c:235
 ext4_reserve_inode_write+0x201/0x290 fs/ext4/inode.c:5978
 __ext4_mark_inode_dirty+0x161/0x7b0 fs/ext4/inode.c:6162
 ext4_dirty_inode+0xbf/0x100 fs/ext4/inode.c:6199
 __mark_inode_dirty+0x2e7/0xe80 fs/fs-writeback.c:2515
 generic_update_time fs/inode.c:1944 [inline]
 inode_update_time fs/inode.c:1957 [inline]
 __file_update_time+0x21d/0x240 fs/inode.c:2145
 file_update_time+0x2f3/0x370 fs/inode.c:2176
 ext4_page_mkwrite+0x1a9/0x10d0 fs/ext4/inode.c:6317
 do_page_mkwrite+0x16b/0x5c0 mm/memory.c:3009
 do_shared_fault mm/memory.c:4694 [inline]
 do_fault mm/memory.c:4762 [inline]
 handle_pte_fault mm/memory.c:5029 [inline]
 __handle_mm_fault mm/memory.c:5171 [inline]
 handle_mm_fault+0x199c/0x3d40 mm/memory.c:5292
 do_user_addr_fault+0x5a9/0xbb0 arch/x86/mm/fault.c:1338
 handle_page_fault arch/x86/mm/fault.c:1429 [inline]
 exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1482
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7fa4afc740b1
RSP: 002b:00007ffe92925300 EFLAGS: 00010202
RAX: 0000001b3001a000 RBX: ffffffff8a2a704c RCX: 0000001b30019ff8
RDX: 0000001b2fa2421c RSI: 0000000000000008 RDI: 00007fa4b0b55720
RBP: 000000000000018d R08: 00007fa4b0010000 R09: 00007fa4b0012000
R10: 000000008a2a7050 R11: 0000000000000003 R12: 00007fa4b0026128
R13: 0000000000000a24 R14: ffffffff8a2a7548 R15: 00007fa4b0b55720
 </TASK>
INFO: task syz.5.1864:9296 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.1864      state:D stack:25360 pid:9296  ppid:6972   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5257 [inline]
 __schedule+0x1089/0x4140 kernel/sched/core.c:6584
 schedule+0xb9/0x180 kernel/sched/core.c:6660
 io_schedule+0x7c/0xd0 kernel/sched/core.c:8848
 bit_wait_io+0xf/0x100 kernel/sched/wait_bit.c:209
 __wait_on_bit+0x9b/0x2c0 kernel/sched/wait_bit.c:49
 out_of_line_wait_on_bit+0x138/0x190 kernel/sched/wait_bit.c:64
 wait_on_bit_io include/linux/wait_bit.h:101 [inline]
 do_get_write_access+0x605/0xf20 fs/jbd2/transaction.c:1115
 jbd2_journal_get_write_access+0x108/0x140 fs/jbd2/transaction.c:1250
 __ext4_journal_get_write_access+0x24b/0x6e0 fs/ext4/ext4_jbd2.c:235
 ext4_reserve_inode_write+0x201/0x290 fs/ext4/inode.c:5978
 __ext4_mark_inode_dirty+0x161/0x7b0 fs/ext4/inode.c:6162
 ext4_dirty_inode+0xbf/0x100 fs/ext4/inode.c:6199
 __mark_inode_dirty+0x2e7/0xe80 fs/fs-writeback.c:2515
 generic_update_time fs/inode.c:1944 [inline]
 inode_update_time fs/inode.c:1957 [inline]
 __file_update_time+0x21d/0x240 fs/inode.c:2145
 file_update_time+0x2f3/0x370 fs/inode.c:2176
 ext4_page_mkwrite+0x1a9/0x10d0 fs/ext4/inode.c:6317
 do_page_mkwrite+0x16b/0x5c0 mm/memory.c:3009
 do_shared_fault mm/memory.c:4694 [inline]
 do_fault mm/memory.c:4762 [inline]
 handle_pte_fault mm/memory.c:5029 [inline]
 __handle_mm_fault mm/memory.c:5171 [inline]
 handle_mm_fault+0x199c/0x3d40 mm/memory.c:5292
 do_user_addr_fault+0x5a9/0xbb0 arch/x86/mm/fault.c:1338
 handle_page_fault arch/x86/mm/fault.c:1429 [inline]
 exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1482
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7fd138a74111
RSP: 002b:00007ffdd0adc250 EFLAGS: 00010202
RAX: 0000001b2fd24000 RBX: 0000000000000000 RCX: 00000000003ffde8
RDX: 0000001b2fd23ffc RSI: 00000000003ffde8 RDI: 00007fd139955700
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fd138e12000
R10: 00007fd139955700 R11: 0000000000000000 R12: 0000000000000000
R13: 000000000007ffff R14: ffffffff8182b1d5 R15: 00007fd139955720
 </TASK>
INFO: task syz.3.1865:9298 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1865      state:D stack:25200 pid:9298  ppid:4277   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5257 [inline]
 __schedule+0x1089/0x4140 kernel/sched/core.c:6584
 schedule+0xb9/0x180 kernel/sched/core.c:6660
 io_schedule+0x7c/0xd0 kernel/sched/core.c:8848
 bit_wait_io+0xf/0x100 kernel/sched/wait_bit.c:209
 __wait_on_bit+0x9b/0x2c0 kernel/sched/wait_bit.c:49
 out_of_line_wait_on_bit+0x138/0x190 kernel/sched/wait_bit.c:64
 wait_on_bit_io include/linux/wait_bit.h:101 [inline]
 do_get_write_access+0x605/0xf20 fs/jbd2/transaction.c:1115
 jbd2_journal_get_write_access+0x108/0x140 fs/jbd2/transaction.c:1250
 __ext4_journal_get_write_access+0x24b/0x6e0 fs/ext4/ext4_jbd2.c:235
 ext4_reserve_inode_write+0x201/0x290 fs/ext4/inode.c:5978
 __ext4_mark_inode_dirty+0x161/0x7b0 fs/ext4/inode.c:6162
 ext4_dirty_inode+0xbf/0x100 fs/ext4/inode.c:6199
 __mark_inode_dirty+0x2e7/0xe80 fs/fs-writeback.c:2515
 generic_update_time fs/inode.c:1944 [inline]
 inode_update_time fs/inode.c:1957 [inline]
 __file_update_time+0x21d/0x240 fs/inode.c:2145
 file_update_time+0x2f3/0x370 fs/inode.c:2176
 ext4_page_mkwrite+0x1a9/0x10d0 fs/ext4/inode.c:6317
 do_page_mkwrite+0x16b/0x5c0 mm/memory.c:3009
 do_shared_fault mm/memory.c:4694 [inline]
 do_fault mm/memory.c:4762 [inline]
 handle_pte_fault mm/memory.c:5029 [inline]
 __handle_mm_fault mm/memory.c:5171 [inline]
 handle_mm_fault+0x199c/0x3d40 mm/memory.c:5292
 do_user_addr_fault+0x5a9/0xbb0 arch/x86/mm/fault.c:1338
 handle_page_fault arch/x86/mm/fault.c:1429 [inline]
 exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1482
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7fe03a474111
RSP: 002b:00007ffd4dfde190 EFLAGS: 00010202
RAX: 0000001b2ff24000 RBX: 0000000000000000 RCX: 00000000003ffde8
RDX: 0000001b2ff23ffc RSI: 00000000003ffde8 RDI: 00007fe03b355700
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fe03a812000
R10: 00007fe03b355700 R11: ffffffff812fffff R12: 0000000000000000
R13: 0000000000003cba R14: ffffffff812f91e0 R15: 00007fe03b355720
 </TASK>
INFO: task syz.0.1866:9299 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.1866      state:D stack:25360 pid:9299  ppid:4274   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5257 [inline]
 __schedule+0x1089/0x4140 kernel/sched/core.c:6584
 schedule+0xb9/0x180 kernel/sched/core.c:6660
 io_schedule+0x7c/0xd0 kernel/sched/core.c:8848
 bit_wait_io+0xf/0x100 kernel/sched/wait_bit.c:209
 __wait_on_bit+0x9b/0x2c0 kernel/sched/wait_bit.c:49
 out_of_line_wait_on_bit+0x138/0x190 kernel/sched/wait_bit.c:64
 wait_on_bit_io include/linux/wait_bit.h:101 [inline]
 do_get_write_access+0x605/0xf20 fs/jbd2/transaction.c:1115
 jbd2_journal_get_write_access+0x108/0x140 fs/jbd2/transaction.c:1250
 __ext4_journal_get_write_access+0x24b/0x6e0 fs/ext4/ext4_jbd2.c:235
 ext4_reserve_inode_write+0x201/0x290 fs/ext4/inode.c:5978
 __ext4_mark_inode_dirty+0x161/0x7b0 fs/ext4/inode.c:6162
 ext4_dirty_inode+0xbf/0x100 fs/ext4/inode.c:6199
 __mark_inode_dirty+0x2e7/0xe80 fs/fs-writeback.c:2515
 generic_update_time fs/inode.c:1944 [inline]
 inode_update_time fs/inode.c:1957 [inline]
 __file_update_time+0x21d/0x240 fs/inode.c:2145
 file_update_time+0x2f3/0x370 fs/inode.c:2176
 ext4_page_mkwrite+0x1a9/0x10d0 fs/ext4/inode.c:6317
 do_page_mkwrite+0x16b/0x5c0 mm/memory.c:3009
 do_shared_fault mm/memory.c:4694 [inline]
 do_fault mm/memory.c:4762 [inline]
 handle_pte_fault mm/memory.c:5029 [inline]
 __handle_mm_fault mm/memory.c:5171 [inline]
 handle_mm_fault+0x199c/0x3d40 mm/memory.c:5292
 do_user_addr_fault+0x5a9/0xbb0 arch/x86/mm/fault.c:1338
 handle_page_fault arch/x86/mm/fault.c:1429 [inline]
 exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1482
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f6212e74111
RSP: 002b:00007fff8489eab0 EFLAGS: 00010202
RAX: 0000001b2fc24000 RBX: 0000000000000000 RCX: 00000000003ffde8
RDX: 0000001b2fc23ffc RSI: 00000000003ffde8 RDI: 00007f6213d55700
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007f6213212000
R10: 00007f6213d55700 R11: 0000000000000000 R12: 0000000000000000
R13: 00000000000736b3 R14: ffffffff812f90fc R15: 00007f6213d55720
 </TASK>
INFO: task syz.4.1867:9302 blocked for more than 145 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.1867      state:D stack:25360 pid:9302  ppid:4273   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5257 [inline]
 __schedule+0x1089/0x4140 kernel/sched/core.c:6584
 schedule+0xb9/0x180 kernel/sched/core.c:6660
 io_schedule+0x7c/0xd0 kernel/sched/core.c:8848
 bit_wait_io+0xf/0x100 kernel/sched/wait_bit.c:209
 __wait_on_bit+0x9b/0x2c0 kernel/sched/wait_bit.c:49
 out_of_line_wait_on_bit+0x138/0x190 kernel/sched/wait_bit.c:64
 wait_on_bit_io include/linux/wait_bit.h:101 [inline]
 do_get_write_access+0x605/0xf20 fs/jbd2/transaction.c:1115
 jbd2_journal_get_write_access+0x108/0x140 fs/jbd2/transaction.c:1250
 __ext4_journal_get_write_access+0x24b/0x6e0 fs/ext4/ext4_jbd2.c:235
 ext4_reserve_inode_write+0x201/0x290 fs/ext4/inode.c:5978
 __ext4_mark_inode_dirty+0x161/0x7b0 fs/ext4/inode.c:6162
 ext4_dirty_inode+0xbf/0x100 fs/ext4/inode.c:6199
 __mark_inode_dirty+0x2e7/0xe80 fs/fs-writeback.c:2515
 generic_update_time fs/inode.c:1944 [inline]
 inode_update_time fs/inode.c:1957 [inline]
 __file_update_time+0x21d/0x240 fs/inode.c:2145
 file_update_time+0x2f3/0x370 fs/inode.c:2176
 ext4_page_mkwrite+0x1a9/0x10d0 fs/ext4/inode.c:6317
 do_page_mkwrite+0x16b/0x5c0 mm/memory.c:3009
 do_shared_fault mm/memory.c:4694 [inline]
 do_fault mm/memory.c:4762 [inline]
 handle_pte_fault mm/memory.c:5029 [inline]
 __handle_mm_fault mm/memory.c:5171 [inline]
 handle_mm_fault+0x199c/0x3d40 mm/memory.c:5292
 do_user_addr_fault+0x5a9/0xbb0 arch/x86/mm/fault.c:1338
 handle_page_fault arch/x86/mm/fault.c:1429 [inline]
 exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1482
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f123c06c7c3
RSP: 002b:00007ffd41cc7890 EFLAGS: 00010246
RAX: 00000000003ffde8 RBX: 0000000000000000 RCX: 0000001b2fc64000
RDX: 0000001b2fc24000 RSI: 0000000000400000 RDI: 00007f123c3e8708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffd41cc7b20
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
 #0: ffffffff8db2e3f0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xce0 kernel/rcu/tasks.h:543
1 lock held by rcu_tasks_trace/13:
 #0: ffffffff8db2ec30 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xce0 kernel/rcu/tasks.h:543
1 lock held by khungtaskd/27:
 #0: ffffffff8db2daa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 #0: ffffffff8db2daa0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
 #0: ffffffff8db2daa0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6669
6 locks held by kworker/u4:2/32:
 #0: ffff888019e65938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
 #1: ffffc90000a8fd00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
 #2: ffff88814d4e40e0 (&type->s_umount_key#31){++++}-{3:3}, at: trylock_super+0x1c/0xf0 fs/super.c:415
 #3: ffff88814d4e6c18 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1785 [inline]
 #3: ffff88814d4e6c18 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x246/0x2fe0 fs/ext4/inode.c:2719
 #4: ffff88807e7b0990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x2014/0x2240 fs/jbd2/transaction.c:463
 #5: ffff888075978c90 (&ei->i_data_sem){++++}-{3:3}, at: ext4_map_blocks+0x914/0x1a90 fs/ext4/inode.c:674
1 lock held by khugepaged/35:
 #0: ffff8880547962d8 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:71 [inline]
 #0: ffff8880547962d8 (&mm->mmap_lock){++++}-{3:3}, at: collapse_huge_page mm/khugepaged.c:1038 [inline]
 #0: ffff8880547962d8 (&mm->mmap_lock){++++}-{3:3}, at: hpage_collapse_scan_pmd+0x1f68/0x57c0 mm/khugepaged.c:1296
1 lock held by klogd/3630:
 #0: ffff8880b8c3ad18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x25/0x130 kernel/sched/core.c:549
2 locks held by getty/4027:
 #0: ffff888032214098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
 #1: ffffc9000327e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x430/0x1400 drivers/tty/n_tty.c:2198
3 locks held by syz-executor/4261:
 #0: ffff8880323488d8 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
 #0: ffff8880323488d8 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5320 [inline]
 #0: ffff8880323488d8 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x2e/0x2f0 mm/memory.c:5382
 #1: ffff88814d4e4558 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1897 [inline]
 #1: ffff88814d4e4558 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:2001 [inline]
 #1: ffff88814d4e4558 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x192/0x10d0 fs/ext4/inode.c:6316
 #2: ffff88807e7b0990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x2014/0x2240 fs/jbd2/transaction.c:463
3 locks held by syz.2.1861/9289:
 #0: ffff8880547962d8 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
 #0: ffff8880547962d8 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5320 [inline]
 #0: ffff8880547962d8 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x2e/0x2f0 mm/memory.c:5382
 #1: ffff88814d4e4558 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1897 [inline]
 #1: ffff88814d4e4558 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:2001 [inline]
 #1: ffff88814d4e4558 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x192/0x10d0 fs/ext4/inode.c:6316
 #2: ffff88807e7b0990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x2014/0x2240 fs/jbd2/transaction.c:463
3 locks held by syz.5.1864/9296:
 #0: ffff88807e10db58 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
 #0: ffff88807e10db58 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5320 [inline]
 #0: ffff88807e10db58 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x2e/0x2f0 mm/memory.c:5382
 #1: ffff88814d4e4558 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1897 [inline]
 #1: ffff88814d4e4558 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:2001 [inline]
 #1: ffff88814d4e4558 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x192/0x10d0 fs/ext4/inode.c:6316
 #2: ffff88807e7b0990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x2014/0x2240 fs/jbd2/transaction.c:463
3 locks held by syz.3.1865/9298:
 #0: ffff8880547971d8 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
 #0: ffff8880547971d8 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5320 [inline]
 #0: ffff8880547971d8 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x2e/0x2f0 mm/memory.c:5382
 #1: ffff88814d4e4558 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1897 [inline]
 #1: ffff88814d4e4558 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:2001 [inline]
 #1: ffff88814d4e4558 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x192/0x10d0 fs/ext4/inode.c:6316
 #2: ffff88807e7b0990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x2014/0x2240 fs/jbd2/transaction.c:463
3 locks held by syz.0.1866/9299:
 #0: ffff88807e109f58 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
 #0: ffff88807e109f58 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5320 [inline]
 #0: ffff88807e109f58 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x2e/0x2f0 mm/memory.c:5382
 #1: ffff88814d4e4558 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1897 [inline]
 #1: ffff88814d4e4558 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:2001 [inline]
 #1: ffff88814d4e4558 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x192/0x10d0 fs/ext4/inode.c:6316
 #2: ffff88807e7b0990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x2014/0x2240 fs/jbd2/transaction.c:463
3 locks held by syz.4.1867/9302:
 #0: ffff888054790158 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
 #0: ffff888054790158 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5320 [inline]
 #0: ffff888054790158 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x2e/0x2f0 mm/memory.c:5382
 #1: ffff88814d4e4558 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1897 [inline]
 #1: ffff88814d4e4558 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:2001 [inline]
 #1: ffff88814d4e4558 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x192/0x10d0 fs/ext4/inode.c:6316
 #2: ffff88807e7b0990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x2014/0x2240 fs/jbd2/transaction.c:463

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

NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
 nmi_cpu_backtrace+0x3e6/0x460 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x1d4/0x450 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+0xf0e/0xf50 kernel/hung_task.c:377
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 0 skipped: idling at default_idle+0xb/0x10 arch/x86/kernel/process.c:741