INFO: task syz-executor.3:5639 blocked for more than 143 seconds.
Not tainted 5.15.185-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3 state:D stack:23680 pid: 5639 ppid: 4505 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5030 [inline]
__schedule+0x11b8/0x43b0 kernel/sched/core.c:6376
schedule+0x11b/0x1e0 kernel/sched/core.c:6459
wb_wait_for_completion+0x164/0x290 fs/fs-writeback.c:191
__writeback_inodes_sb_nr+0x1f3/0x240 fs/fs-writeback.c:2684
try_to_writeback_inodes_sb+0x96/0xc0 fs/fs-writeback.c:2732
ext4_nonda_switch fs/ext4/inode.c:2945 [inline]
ext4_da_write_begin+0x213/0xb30 fs/ext4/inode.c:2972
generic_perform_write+0x2aa/0x530 mm/filemap.c:3785
ext4_buffered_write_iter+0x25f/0x3b0 fs/ext4/file.c:268
ext4_file_write_iter+0x773/0x17b0 fs/ext4/file.c:-1
__kernel_write+0x4f9/0x930 fs/read_write.c:539
__dump_emit+0x243/0x360 fs/coredump.c:943
dump_user_range+0x84/0x340 fs/coredump.c:1017
elf_core_dump+0x2ff7/0x3530 fs/binfmt_elf.c:2285
do_coredump+0x1419/0x2960 fs/coredump.c:894
get_signal+0x40a/0x12c0 kernel/signal.c:2886
arch_do_signal_or_restart+0xc1/0x1300 arch/x86/kernel/signal.c:867
handle_signal_work kernel/entry/common.c:154 [inline]
exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:320
exc_page_fault+0x88/0x100 arch/x86/mm/fault.c:1504
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0xe9
RSP: 002b:0000000020000268 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fb85173df80 RCX: 00007fb85161eb29
RDX: 0000000000000000 RSI: 0000000020000260 RDI: 0000000000000000
RBP: 00007fb85166a47a R08: 0000000020000300 R09: 0000000020000300
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fb85173df80 R15: 00007fffbe104888
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8c11bfa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/3933:
#0: ffff88814ccdc098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc900026462e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x5ba/0x1a30 drivers/tty/n_tty.c:2158
3 locks held by syz-executor.0/4503:
#0: ffff888078730370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2bf/0x370 fs/file.c:1058
#1: ffff8880646335c8 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: iterate_dir+0x10d/0x560 fs/readdir.c:55
#2: ffff88814cd24460 (sb_writers#5){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2521 [inline]
#2: ffff88814cd24460 (sb_writers#5){.+.+}-{0:0}, at: iterate_dir+0x482/0x560 fs/readdir.c:70
2 locks held by syz-executor.3/4505:
#0: ffff888024ebcaf0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2bf/0x370 fs/file.c:1058
#1: ffff88806449d3b0 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: iterate_dir+0x10d/0x560 fs/readdir.c:55
2 locks held by syz-executor.2/4509:
#0: ffff888026abcd70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2bf/0x370 fs/file.c:1058
#1: ffff88805d7f5da8 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: iterate_dir+0x10d/0x560 fs/readdir.c:55
4 locks held by kworker/u4:5/4548:
#0: ffff8880189dd938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x760/0x1000 kernel/workqueue.c:-1
#1: ffffc9000356fd00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x7a3/0x1000 kernel/workqueue.c:2285
#2: ffff88814cd26bd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1c0/0x2d20 fs/ext4/inode.c:2689
#3: ffffffff8c11bfa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:311
3 locks held by syz-executor.3/5639:
#0: ffff88814cd24460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x13fd/0x2960 fs/coredump.c:893
#1: ffff8880645b67a0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff8880645b67a0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xa6/0x3b0 fs/ext4/file.c:262
#2: ffff88814cd240e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1e/0xc0 fs/fs-writeback.c:2729
3 locks held by syz-executor.0/6113:
#0: ffff8880b903a318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475
#1: ffff8880b9027848 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x512/0x810 kernel/sched/psi.c:891
#2: ffff88801b6eadb8 (&sig->wait_chldexit){....}-{2:2}, at: __wake_up_common_lock kernel/sched/wait.c:137 [inline]
#2: ffff88801b6eadb8 (&sig->wait_chldexit){....}-{2:2}, at: __wake_up_sync_key+0xf0/0x180 kernel/sched/wait.c:205
1 lock held by syz-executor.3/6114:
#0: ffff88814cd26bd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1c0/0x2d20 fs/ext4/inode.c:2689
1 lock held by syz-executor.0/6118:
#0: ffff88814cd26bd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1c0/0x2d20 fs/ext4/inode.c:2689
2 locks held by syz-executor.5/6127:
#0: ffff88814cd26bd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1c0/0x2d20 fs/ext4/inode.c:2689
#1: ffff88807f5c83f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: __jbd2_log_wait_for_space+0x216/0x660 fs/jbd2/checkpoint.c:71
2 locks held by syz-executor.1/6130:
#0: ffff88814cd26bd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1c0/0x2d20 fs/ext4/inode.c:2689
#1: ffff88807f5c83f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: __jbd2_log_wait_for_space+0x216/0x660 fs/jbd2/checkpoint.c:71
2 locks held by syz-executor.1/6131:
#0: ffff88814cd26bd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1c0/0x2d20 fs/ext4/inode.c:2689
#1: ffff88807f5c83f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: __jbd2_log_wait_for_space+0x216/0x660 fs/jbd2/checkpoint.c:71
3 locks held by syz-executor.2/6137:
2 locks held by syz-executor.0/6156:
#0: ffff88814cd26bd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1c0/0x2d20 fs/ext4/inode.c:2689
#1: ffff88807f5c83f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: __jbd2_log_wait_for_space+0x216/0x660 fs/jbd2/checkpoint.c:71
2 locks held by syz-executor.0/6164:
#0: ffff88814cd26bd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1c0/0x2d20 fs/ext4/inode.c:2689
#1: ffff88807f5c83f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: __jbd2_log_wait_for_space+0x216/0x660 fs/jbd2/checkpoint.c:71
2 locks held by syz-executor.1/6168:
#0: ffff88814cd26bd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1c0/0x2d20 fs/ext4/inode.c:2689
#1: ffff88807f5c83f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: __jbd2_log_wait_for_space+0x216/0x660 fs/jbd2/checkpoint.c:71
2 locks held by syz-executor.2/6178:
2 locks held by syz-executor.5/6180:
#0: ffff88814cd26bd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1c0/0x2d20 fs/ext4/inode.c:2689
#1: ffff88807f5c83f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: __jbd2_log_wait_for_space+0x216/0x660 fs/jbd2/checkpoint.c:71
3 locks held by syz-executor.2/6185:
2 locks held by syz-executor.5/6187:
#0: ffff88814cd26bd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1c0/0x2d20 fs/ext4/inode.c:2689
#1: ffff88807f5c83f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: __jbd2_log_wait_for_space+0x216/0x660 fs/jbd2/checkpoint.c:71
2 locks held by syz-executor.0/6199:
#0: ffff88814cd26bd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1c0/0x2d20 fs/ext4/inode.c:2689
#1: ffff88807f5c83f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: __jbd2_log_wait_for_space+0x216/0x660 fs/jbd2/checkpoint.c:71
2 locks held by syz-executor.5/6204:
#0: ffff88814cd26bd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1c0/0x2d20 fs/ext4/inode.c:2689
#1: ffff8880b903a318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475
1 lock held by syz-executor.5/6206:
2 locks held by syz-executor.4/6220:
2 locks held by syz-executor.1/6225:
#0: ffff88814cd26bd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1c0/0x2d20 fs/ext4/inode.c:2689
#1: ffff88807f5c83f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: __jbd2_log_wait_for_space+0x216/0x660 fs/jbd2/checkpoint.c:71
2 locks held by syz-executor.4/6226:
1 lock held by syz-executor.2/6230:
2 locks held by syz-executor.0/6245:
#0: ffff88814cd26bd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1c0/0x2d20 fs/ext4/inode.c:2689
#1: ffff88807f5c83f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: __jbd2_log_wait_for_space+0x216/0x660 fs/jbd2/checkpoint.c:71
1 lock held by syz-executor.1/6246:
#0: ffff88814cd26bd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1c0/0x2d20 fs/ext4/inode.c:2689
1 lock held by syz-executor.3/6251:
1 lock held by syz-executor.2/6252:
1 lock held by syz-executor.5/6260:
1 lock held by syz-executor.4/6266:
1 lock held by syz-executor.4/6267:
1 lock held by syz-executor.2/6272:
1 lock held by syz-executor.1/6283:
1 lock held by syz-executor.0/6300:
1 lock held by syz-executor.2/6305:
1 lock held by syz-executor.5/6316:
1 lock held by syz-executor.2/6319:
1 lock held by syz-executor.1/6320:
2 locks held by syz-executor.0/6330:
1 lock held by syz-executor.5/6338:
#0: ffff88814cd26bd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1c0/0x2d20 fs/ext4/inode.c:2689
1 lock held by syz-executor.5/6340:
1 lock held by syz-executor.0/6357:
1 lock held by syz-executor.1/6372:
1 lock held by syz-executor.2/6375:
1 lock held by syz-executor.0/6396:
1 lock held by syz-executor.3/6404:
#0: ffff88814cd26bd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1c0/0x2d20 fs/ext4/inode.c:2689
1 lock held by syz-executor.1/6418:
1 lock held by syz-executor.2/6420:
1 lock held by syz-executor.5/6437:
1 lock held by syz-executor.0/6452:
2 locks held by syz-executor.2/6455:
1 lock held by syz-executor.2/6456:
1 lock held by syz-executor.5/6479:
1 lock held by syz-executor.1/6511:
1 lock held by syz-executor.2/6652:
1 lock held by syz-executor.1/6691:
#0: ffff88814cd26bd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1c0/0x2d20 fs/ext4/inode.c:2689
1 lock held by syz-executor.2/6747:
1 lock held by syz-executor.0/7219:
1 lock held by syz-executor.2/7821:
2 locks held by syz-executor.2/7822:
1 lock held by syz-executor.0/7825:
2 locks held by syz-executor.0/7826:
1 lock held by syz-executor.5/7838:
1 lock held by syz-executor.1/7847:
#0: ffff88814cd26bd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1c0/0x2d20 fs/ext4/inode.c:2689
1 lock held by syz-executor.1/7844:
1 lock held by syz-executor.3/7853:
1 lock held by syz-executor.2/7874:
1 lock held by syz-executor.5/7875:
1 lock held by syz-executor.5/7882:
1 lock held by syz-executor.1/7894:
1 lock held by syz-executor.3/7900:
1 lock held by syz-executor.0/7904:
1 lock held by syz-executor.0/7905:
1 lock held by syz-executor.3/7906:
1 lock held by syz-executor.4/7915:
1 lock held by syz-executor.2/7923:
1 lock held by syz-executor.5/7934:
1 lock held by syz-executor.3/7936:
1 lock held by syz-executor.4/7943:
1 lock held by syz-executor.1/7946:
1 lock held by syz-executor.3/7948:
1 lock held by syz-executor.2/7957:
1 lock held by syz-executor.5/7973:
3 locks held by syz-executor.0/7976:
1 lock held by syz-executor.2/7994:
1 lock held by syz-executor.2/7998:
1 lock held by syz-executor.5/8002:
1 lock held by syz-executor.0/8007:
1 lock held by syz-executor.0/8009:
3 locks held by syz-executor.3/8025:
1 lock held by syz-executor.3/8028:
1 lock held by syz-executor.4/8041:
3 locks held by syz-executor.4/8042:
5 locks held by syz-executor.2/8050:
2 locks held by syz-executor.2/8063:
2 locks held by syz-executor.3/8067:
3 locks held by syz-executor.3/8069:
1 lock held by syz-executor.0/8082:
1 lock held by syz-executor.4/8092:
2 locks held by syz-executor.5/8113:
3 locks held by syz-executor.1/8117:
1 lock held by syz-executor.1/8120:
1 lock held by syz-executor.3/8122:
#0: ffff88814cd26bd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1c0/0x2d20 fs/ext4/inode.c:2689
1 lock held by syz-executor.4/8141:
1 lock held by syz-executor.3/8177:
1 lock held by syz-executor.5/8181:
1 lock held by syz-executor.0/8185:
2 locks held by syz-executor.3/8188:
3 locks held by syz-executor.0/8195:
1 lock held by syz-executor.1/8205:
3 locks held by syz-executor.4/8212:
1 lock held by syz-executor.1/8214:
#0: ffff88814cd26bd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1c0/0x2d20 fs/ext4/inode.c:2689
2 locks held by syz-executor.2/8235:
3 locks held by syz-executor.3/8237:
1 lock held by syz-executor.0/8254:
2 locks held by syz-executor.0/8256:
1 lock held by syz-executor.1/8259:
#0: ffff88814cd26bd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1c0/0x2d20 fs/ext4/inode.c:2689
1 lock held by syz-executor.1/8260:
2 locks held by syz-executor.0/8271:
1 lock held by syz-executor.1/8283:
1 lock held by syz-executor.3/8286:
3 locks held by syz-executor.3/8289:
4 locks held by syz-executor.3/8597:
1 lock held by syz-executor.1/8623:
#0: ffffffff8c120a28 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline]
#0: ffffffff8c120a28 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x347/0x6b0 kernel/rcu/tree_exp.h:845
4 locks held by syz-executor.0/8845:
1 lock held by syz-executor.5/9143:
#0: ffffffff8c120a28 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline]
#0: ffffffff8c120a28 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x320/0x6b0 kernel/rcu/tree_exp.h:845
4 locks held by syz-executor.2/9149:
2 locks held by syz-executor.2/9495:
4 locks held by syz-executor.3/9549:
3 locks held by syz-executor.4/9674:
2 locks held by syz-executor.4/9949:
2 locks held by syz-executor.4/9951:
4 locks held by syz-executor.0/9957:
5 locks held by syz-executor.3/9999:
3 locks held by syz-executor.2/10006:
4 locks held by syz-executor.3/10007:
3 locks held by syz-executor.0/10071:
1 lock held by syz-executor.2/10095:
2 locks held by syz-executor.4/10099:
#0: ffff88814cd24460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x13fd/0x2960 fs/coredump.c:893
#1: ffff888057f903f0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff888057f903f0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xa6/0x3b0 fs/ext4/file.c:262
2 locks held by syz-executor.3/10133:
2 locks held by syz-executor.0/10149:
#0: ffff88814cd24460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x13fd/0x2960 fs/coredump.c:893
#1: ffff8880644a8de8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff8880644a8de8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xa6/0x3b0 fs/ext4/file.c:262
2 locks held by syz-executor.4/10180:
#0: ffff88814cd24460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x13fd/0x2960 fs/coredump.c:893
#1: ffff888048290de8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff888048290de8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xa6/0x3b0 fs/ext4/file.c:262
2 locks held by syz-executor.3/10181:
#0: ffff88814cd24460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:377
#1: ffff888057f9abd0 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:822 [inline]
#1: ffff888057f9abd0 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: filename_create+0x1f2/0x450 fs/namei.c:3835
3 locks held by syz-executor.4/10195:
#0: ffff88814cd24460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:377
#1: ffff888057f7bfc0 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:822 [inline]
#1: ffff888057f7bfc0 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: do_unlinkat+0x1b9/0x6f0 fs/namei.c:4331
#2: ffff888048290de8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#2: ffff888048290de8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: vfs_unlink+0xee/0x600 fs/namei.c:4269
3 locks held by syz-executor.2/10210:
#0: ffff88814cd24460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:377
#1: ffff888057f9dda8 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:822 [inline]
#1: ffff888057f9dda8 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: filename_create+0x1f2/0x450 fs/namei.c:3835
#2: ffff88807f5c83f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: jbd2_log_do_checkpoint+0xacb/0xe20 fs/jbd2/checkpoint.c:243
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.185-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
nmi_cpu_backtrace+0x397/0x3d0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
watchdog+0xe0f/0xe50 kernel/hung_task.c:369
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 7936 Comm: syz-executor.3 Not tainted 5.15.185-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:check_kcov_mode kernel/kcov.c:174 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x2c/0x60 kernel/kcov.c:206
Code: 04 24 65 48 8b 0d 94 ad 8a 7e 65 8b 15 95 ad 8a 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 34 16 00 00 00 74 2c <8b> 91 10 16 00 00 83 fa 02 75 21 48 8b 91 18 16 00 00 48 8b 32 48
RSP: 0018:ffffc9000315f1d8 EFLAGS: 00000246
RAX: ffffffff819e29a3 RBX: ffffc9000315f240 RCX: ffff8880191bd940
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffc9000315f300 R08: dffffc0000000000 R09: fffff940003191ef
R10: fffff940003191ef R11: 1ffffd40003191ee R12: 0000000000000989
R13: 0000000000000000 R14: dffffc0000000000 R15: ffffea00018c8f40
FS: 0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555916d0788 CR3: 0000000021c83000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
find_get_entry mm/filemap.c:1996 [inline]
find_get_pages_range+0x303/0x620 mm/filemap.c:2163
pagevec_lookup_range+0x30/0x70 mm/swap.c:1104
mpage_map_and_submit_buffers fs/ext4/inode.c:2344 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2500 [inline]
ext4_writepages+0x160c/0x2d20 fs/ext4/inode.c:2829
do_writepages+0x48d/0x6d0 mm/page-writeback.c:2386
filemap_fdatawrite_wbc+0x1eb/0x240 mm/filemap.c:400
__filemap_fdatawrite_range mm/filemap.c:433 [inline]
__filemap_fdatawrite mm/filemap.c:439 [inline]
filemap_flush+0xb3/0x100 mm/filemap.c:466
ext4_release_file+0x7e/0x310 fs/ext4/file.c:141
__fput+0x234/0x930 fs/file_table.c:311
task_work_run+0x125/0x1a0 kernel/task_work.c:188
exit_task_work include/linux/task_work.h:33 [inline]
do_exit+0x616/0x20a0 kernel/exit.c:874
do_group_exit+0x12e/0x300 kernel/exit.c:996
get_signal+0x6ca/0x12c0 kernel/signal.c:2900
arch_do_signal_or_restart+0xc1/0x1300 arch/x86/kernel/signal.c:867
handle_signal_work kernel/entry/common.c:154 [inline]
exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:320
exc_page_fault+0x88/0x100 arch/x86/mm/fault.c:1504
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 002b:0000000020000048 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fb85173df80 RCX: 00007fb85161eb29
RDX: 0000000020000140 RSI: 0000000020000040 RDI: 0000000000008000
RBP: 00007fb85166a47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 000000000000000b R14: 00007fb85173df80 R15: 00007fffbe104888