INFO: task kworker/u8:2:36 blocked for more than 143 seconds.
Not tainted 6.15.0-syzkaller-13743-g8630c59e9936 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:2 state:D stack:24072 pid:36 tgid:36 ppid:2 task_flags:0x4248060 flags:0x00004000
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x116a/0x5de0 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6878
io_schedule+0xbf/0x130 kernel/sched/core.c:7723
bit_wait_io+0x15/0xe0 kernel/sched/wait_bit.c:247
__wait_on_bit+0x62/0x180 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0xd9/0x110 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x93d/0x1320 fs/jbd2/transaction.c:1092
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1241
__ext4_journal_get_write_access+0x6a/0x340 fs/ext4/ext4_jbd2.c:242
ext4_mb_mark_context+0x1db/0xd40 fs/ext4/mballoc.c:4014
ext4_mb_mark_diskspace_used+0x466/0x8c0 fs/ext4/mballoc.c:4131
ext4_mb_new_blocks+0xa5b/0x4f00 fs/ext4/mballoc.c:6233
ext4_ext_map_blocks+0x1cc9/0x5ff0 fs/ext4/extents.c:4383
ext4_map_create_blocks fs/ext4/inode.c:609 [inline]
ext4_map_blocks+0x6b4/0x14b0 fs/ext4/inode.c:813
mpage_map_one_extent fs/ext4/inode.c:2348 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2401 [inline]
ext4_do_writepages+0x1a2c/0x3490 fs/ext4/inode.c:2863
ext4_writepages+0x37a/0x7d0 fs/ext4/inode.c:2953
do_writepages+0x277/0x600 mm/page-writeback.c:2636
__writeback_single_inode+0x160/0xfb0 fs/fs-writeback.c:1680
writeback_sb_inodes+0x601/0xf90 fs/fs-writeback.c:1976
__writeback_inodes_wb+0xf8/0x2d0 fs/fs-writeback.c:2047
wb_writeback+0x7f3/0xb70 fs/fs-writeback.c:2158
wb_check_old_data_flush fs/fs-writeback.c:2262 [inline]
wb_do_writeback fs/fs-writeback.c:2315 [inline]
wb_workfn+0x8ca/0xbe0 fs/fs-writeback.c:2343
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3321 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: task jbd2/sda1-8:5167 blocked for more than 143 seconds.
Not tainted 6.15.0-syzkaller-13743-g8630c59e9936 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:jbd2/sda1-8 state:D stack:26664 pid:5167 tgid:5167 ppid:2 task_flags:0x240040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x116a/0x5de0 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6878
io_schedule+0xbf/0x130 kernel/sched/core.c:7723
bit_wait_io+0x15/0xe0 kernel/sched/wait_bit.c:247
__wait_on_bit+0x62/0x180 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0xd9/0x110 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
__wait_on_buffer+0x64/0x70 fs/buffer.c:123
wait_on_buffer include/linux/buffer_head.h:422 [inline]
jbd2_journal_commit_transaction+0x387b/0x68f0 fs/jbd2/commit.c:808
kjournald2+0x1f4/0x760 fs/jbd2/journal.c:201
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: task syz.1.2:5928 blocked for more than 144 seconds.
Not tainted 6.15.0-syzkaller-13743-g8630c59e9936 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.2 state:D stack:25512 pid:5928 tgid:5928 ppid:5844 task_flags:0x440040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x116a/0x5de0 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6878
io_schedule+0xbf/0x130 kernel/sched/core.c:7723
bit_wait_io+0x15/0xe0 kernel/sched/wait_bit.c:247
__wait_on_bit+0x62/0x180 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0xd9/0x110 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x93d/0x1320 fs/jbd2/transaction.c:1092
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1241
__ext4_journal_get_write_access+0x6a/0x340 fs/ext4/ext4_jbd2.c:242
ext4_reserve_inode_write+0x1be/0x340 fs/ext4/inode.c:6247
__ext4_mark_inode_dirty+0x197/0x870 fs/ext4/inode.c:6422
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:6459
__mark_inode_dirty+0x1eb/0xe50 fs/fs-writeback.c:2527
generic_update_time+0xcf/0xf0 fs/inode.c:2064
inode_update_time fs/inode.c:2077 [inline]
__file_update_time fs/inode.c:2305 [inline]
file_update_time+0x17d/0x1c0 fs/inode.c:2335
ext4_page_mkwrite+0x35e/0x1760 fs/ext4/inode.c:6577
do_page_mkwrite+0x171/0x380 mm/memory.c:3378
do_shared_fault mm/memory.c:5686 [inline]
do_fault mm/memory.c:5748 [inline]
do_pte_missing mm/memory.c:4251 [inline]
handle_pte_fault mm/memory.c:6089 [inline]
__handle_mm_fault+0x3829/0x5490 mm/memory.c:6232
handle_mm_fault+0x589/0xd10 mm/memory.c:6401
do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f34d2c6f262
RSP: 002b:00007fff74fe8910 EFLAGS: 00010202
RAX: 0000000000019008 RBX: 00007f34d3ae5720 RCX: 0000000000000000
RDX: 0000001b30707000 RSI: 0000000000000008 RDI: 00007f34d3ae5720
RBP: 000000000000048f R08: 00007f34d1bfb0b0 R09: 00007f34d2fa2000
R10: 00007f34d1bfb008 R11: 0000000000000016 R12: ffffffff825f7384
R13: 00007f34d2fb61f8 R14: 0000000000000100 R15: fffffffffffe7000
INFO: task syz.3.5:5935 blocked for more than 144 seconds.
Not tainted 6.15.0-syzkaller-13743-g8630c59e9936 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.5 state:D stack:26280 pid:5935 tgid:5935 ppid:5840 task_flags:0x440040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x116a/0x5de0 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6878
io_schedule+0xbf/0x130 kernel/sched/core.c:7723
bit_wait_io+0x15/0xe0 kernel/sched/wait_bit.c:247
__wait_on_bit+0x62/0x180 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0xd9/0x110 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x93d/0x1320 fs/jbd2/transaction.c:1092
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1241
__ext4_journal_get_write_access+0x6a/0x340 fs/ext4/ext4_jbd2.c:242
ext4_reserve_inode_write+0x1be/0x340 fs/ext4/inode.c:6247
__ext4_mark_inode_dirty+0x197/0x870 fs/ext4/inode.c:6422
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:6459
__mark_inode_dirty+0x1eb/0xe50 fs/fs-writeback.c:2527
generic_update_time+0xcf/0xf0 fs/inode.c:2064
inode_update_time fs/inode.c:2077 [inline]
__file_update_time fs/inode.c:2305 [inline]
file_update_time+0x17d/0x1c0 fs/inode.c:2335
ext4_page_mkwrite+0x35e/0x1760 fs/ext4/inode.c:6577
do_page_mkwrite+0x171/0x380 mm/memory.c:3378
do_shared_fault mm/memory.c:5686 [inline]
do_fault mm/memory.c:5748 [inline]
do_pte_missing mm/memory.c:4251 [inline]
handle_pte_fault mm/memory.c:6089 [inline]
__handle_mm_fault+0x3829/0x5490 mm/memory.c:6232
handle_mm_fault+0x589/0xd10 mm/memory.c:6401
do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f3469e6f262
RSP: 002b:00007ffd5c7187a0 EFLAGS: 00010202
RAX: 0000000000014008 RBX: 00007f346ace5720 RCX: 0000000000000000
RDX: 0000001b3090c000 RSI: 0000000000000008 RDI: 00007f346ace5720
RBP: 0000000000000c15 R08: 00007f34691fd058 R09: 00007f346a1a2000
R10: 00007f34691fd008 R11: 000000000000000b R12: ffffffff839e38ee
R13: 00007f346a1b6118 R14: 00000000000003e9 R15: fffffffffffec000
INFO: task syz.2.3:5937 blocked for more than 144 seconds.
Not tainted 6.15.0-syzkaller-13743-g8630c59e9936 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.3 state:D stack:26280 pid:5937 tgid:5937 ppid:5836 task_flags:0x440040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x116a/0x5de0 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6878
io_schedule+0xbf/0x130 kernel/sched/core.c:7723
bit_wait_io+0x15/0xe0 kernel/sched/wait_bit.c:247
__wait_on_bit+0x62/0x180 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0xd9/0x110 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x93d/0x1320 fs/jbd2/transaction.c:1092
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1241
__ext4_journal_get_write_access+0x6a/0x340 fs/ext4/ext4_jbd2.c:242
ext4_reserve_inode_write+0x1be/0x340 fs/ext4/inode.c:6247
__ext4_mark_inode_dirty+0x197/0x870 fs/ext4/inode.c:6422
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:6459
__mark_inode_dirty+0x1eb/0xe50 fs/fs-writeback.c:2527
generic_update_time+0xcf/0xf0 fs/inode.c:2064
inode_update_time fs/inode.c:2077 [inline]
__file_update_time fs/inode.c:2305 [inline]
file_update_time+0x17d/0x1c0 fs/inode.c:2335
ext4_page_mkwrite+0x35e/0x1760 fs/ext4/inode.c:6577
do_page_mkwrite+0x171/0x380 mm/memory.c:3378
do_shared_fault mm/memory.c:5686 [inline]
do_fault mm/memory.c:5748 [inline]
do_pte_missing mm/memory.c:4251 [inline]
handle_pte_fault mm/memory.c:6089 [inline]
__handle_mm_fault+0x3829/0x5490 mm/memory.c:6232
handle_mm_fault+0x589/0xd10 mm/memory.c:6401
do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7fbcf1c6f262
RSP: 002b:00007fffb02fdbf0 EFLAGS: 00010202
RAX: 0000000000005008 RBX: 00007fbcf2ae5720 RCX: 0000000000000000
RDX: 0000001b3081b000 RSI: 0000000000000008 RDI: 00007fbcf2ae5720
RBP: 0000000000000310 R08: 00007fbcf0ffd058 R09: 00007fbcf1fa2000
R10: 00007fbcf0ffd008 R11: 0000000000000003 R12: ffffffff848ae8a3
R13: 00007fbcf1fb6118 R14: 0000000000000172 R15: ffffffffffffb000
INFO: task syz.0.6:5943 blocked for more than 145 seconds.
Not tainted 6.15.0-syzkaller-13743-g8630c59e9936 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.6 state:D stack:27656 pid:5943 tgid:5943 ppid:5832 task_flags:0x440040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x116a/0x5de0 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6878
io_schedule+0xbf/0x130 kernel/sched/core.c:7723
bit_wait_io+0x15/0xe0 kernel/sched/wait_bit.c:247
__wait_on_bit+0x62/0x180 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0xd9/0x110 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x93d/0x1320 fs/jbd2/transaction.c:1092
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1241
__ext4_journal_get_write_access+0x6a/0x340 fs/ext4/ext4_jbd2.c:242
ext4_reserve_inode_write+0x1be/0x340 fs/ext4/inode.c:6247
__ext4_mark_inode_dirty+0x197/0x870 fs/ext4/inode.c:6422
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:6459
__mark_inode_dirty+0x1eb/0xe50 fs/fs-writeback.c:2527
generic_update_time+0xcf/0xf0 fs/inode.c:2064
inode_update_time fs/inode.c:2077 [inline]
__file_update_time fs/inode.c:2305 [inline]
file_update_time+0x17d/0x1c0 fs/inode.c:2335
ext4_page_mkwrite+0x35e/0x1760 fs/ext4/inode.c:6577
do_page_mkwrite+0x171/0x380 mm/memory.c:3378
do_shared_fault mm/memory.c:5686 [inline]
do_fault mm/memory.c:5748 [inline]
do_pte_missing mm/memory.c:4251 [inline]
handle_pte_fault mm/memory.c:6089 [inline]
__handle_mm_fault+0x3829/0x5490 mm/memory.c:6232
handle_mm_fault+0x589/0xd10 mm/memory.c:6401
do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f69f8c6f262
RSP: 002b:00007ffc94adf160 EFLAGS: 00010202
RAX: 000000000000b008 RBX: 00007f69f9ae5720 RCX: 0000000000000000
RDX: 0000001b30615000 RSI: 0000000000000008 RDI: 00007f69f9ae5720
RBP: 0000000000000a3e R08: 00007f69f83ff060 R09: 00007f69f8fa2000
R10: 00007f69f83ff008 R11: 0000000000000007 R12: ffffffff89954b14
R13: 00007f69f8fb6038 R14: 00000000000001f9 R15: ffffffffffff5000
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e3c4b40 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e3c4b40 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e3c4b40 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6770
7 locks held by kworker/u8:2/36:
#0: ffff88801fafd948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1: ffffc90000ac7d10 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2: ffff8880332aa0e0 (&type->s_umount_key#31){++++}-{4:4}, at: super_trylock_shared+0x1e/0xf0 fs/super.c:563
#3: ffff8880332acb98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x277/0x600 mm/page-writeback.c:2636
#4: ffff8880332ae950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x5e4/0x1410 fs/jbd2/transaction.c:444
#5: ffff8880774c3bd0 (&ei->i_data_sem){++++}-{4:4}, at: ext4_map_blocks+0x5b6/0x14b0 fs/ext4/inode.c:812
#6: ffffe8ffffd1e878 (&lg->lg_mutex){+.+.}-{4:4}, at: ext4_mb_group_or_file fs/ext4/mballoc.c:5784 [inline]
#6: ffffe8ffffd1e878 (&lg->lg_mutex){+.+.}-{4:4}, at: ext4_mb_initialize_context+0x81c/0xdf0 fs/ext4/mballoc.c:5828
2 locks held by getty/5598:
#0: ffff88814c45a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222
3 locks held by syz-executor/5823:
#0: ffff888077ef0448 (vm_lock){++++}-{0:0}, at: do_user_addr_fault+0x452/0x1370 arch/x86/mm/fault.c:1327
#1: ffff8880332aa520 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x171/0x380 mm/memory.c:3378
#2: ffff8880332ae950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x5e4/0x1410 fs/jbd2/transaction.c:444
3 locks held by syz.1.2/5928:
#0: ffff8880781381c8 (vm_lock){++++}-{0:0}, at: do_user_addr_fault+0x452/0x1370 arch/x86/mm/fault.c:1327
#1: ffff8880332aa520 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x171/0x380 mm/memory.c:3378
#2: ffff8880332ae950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x5e4/0x1410 fs/jbd2/transaction.c:444
3 locks held by syz.3.5/5935:
#0: ffff888025dd1948 (vm_lock){++++}-{0:0}, at: do_user_addr_fault+0x452/0x1370 arch/x86/mm/fault.c:1327
#1: ffff8880332aa520 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x171/0x380 mm/memory.c:3378
#2: ffff8880332ae950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x5e4/0x1410 fs/jbd2/transaction.c:444
3 locks held by syz.2.3/5937:
#0: ffff88807793b588 (vm_lock){++++}-{0:0}, at: do_user_addr_fault+0x452/0x1370 arch/x86/mm/fault.c:1327
#1: ffff8880332aa520 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x171/0x380 mm/memory.c:3378
#2: ffff8880332ae950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x5e4/0x1410 fs/jbd2/transaction.c:444
3 locks held by syz.0.6/5943:
#0: ffff8880359f8308 (vm_lock){++++}-{0:0}, at: do_user_addr_fault+0x452/0x1370 arch/x86/mm/fault.c:1327
#1: ffff8880332aa520 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x171/0x380 mm/memory.c:3378
#2: ffff8880332ae950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x5e4/0x1410 fs/jbd2/transaction.c:444
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-syzkaller-13743-g8630c59e9936 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline]
watchdog+0xf70/0x12c0 kernel/hung_task.c:470
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 49 Comm: kworker/u8:3 Not tainted 6.15.0-syzkaller-13743-g8630c59e9936 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: events_unbound nsim_dev_trap_report_work
RIP: 0010:instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
RIP: 0010:atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:400 [inline]
RIP: 0010:__refcount_sub_and_test include/linux/refcount.h:389 [inline]
RIP: 0010:__refcount_dec_and_test include/linux/refcount.h:432 [inline]
RIP: 0010:refcount_dec_and_test include/linux/refcount.h:450 [inline]
RIP: 0010:skb_unref include/linux/skbuff.h:1245 [inline]
RIP: 0010:consume_skb+0x2b/0x100 net/core/skbuff.c:1394
Code: 0f 1e fa 41 54 55 53 48 89 fb e8 90 d8 6b f8 48 85 db 74 4d 4c 8d a3 e4 00 00 00 bd ff ff ff ff e8 7a d8 6b f8 be 04 00 00 00 <4c> 89 e7 e8 ed a6 d1 f8 f0 0f c1 ab e4 00 00 00 31 ff 89 ee e8 9c
RSP: 0018:ffffc90000b97b80 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff888033f4aa00 RCX: 0000000000000006
RDX: ffff888022edbc00 RSI: 0000000000000004 RDI: ffff888033f4aa00
RBP: 00000000ffffffff R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90883657 R11: 0000000000000001 R12: ffff888033f4aae4
R13: ffffffff8c4ff61c R14: dffffc0000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888124a62000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f1ead1c2a8 CR3: 000000003573e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
nsim_dev_trap_report drivers/net/netdevsim/dev.c:821 [inline]
nsim_dev_trap_report_work+0x8bd/0xcf0 drivers/net/netdevsim/dev.c:851
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3321 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245