INFO: task syz.0.15:6645 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.15 state:D stack:28856 pid:6645 tgid:6644 ppid:6347 task_flags:0x400040 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5325 [inline] __schedule+0x1190/0x5de0 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:7026 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083 rwsem_down_write_slowpath+0x521/0x1310 kernel/locking/rwsem.c:1185 __down_write_common kernel/locking/rwsem.c:1317 [inline] __down_write kernel/locking/rwsem.c:1326 [inline] down_write+0x1d6/0x200 kernel/locking/rwsem.c:1591 inode_lock include/linux/fs.h:980 [inline] blkdev_fallocate+0x24c/0x430 block/fops.c:911 vfs_fallocate+0x5b4/0x10e0 fs/open.c:342 ksys_fallocate fs/open.c:366 [inline] __do_sys_fallocate fs/open.c:371 [inline] __se_sys_fallocate fs/open.c:369 [inline] __x64_sys_fallocate+0xd5/0x150 fs/open.c:369 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe37e57fed9 RSP: 002b:00007fe37f3b3058 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007fe37e745fa0 RCX: 00007fe37e57fed9 RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000004 RBP: 00007fe37e5f3cc8 R08: 0000000000000000 R09: 0000000000000000 R10: 7fffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fe37e745fa0 R15: 00007ffe530a5c08 INFO: task syz.1.16:6664 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.16 state:D stack:28856 pid:6664 tgid:6662 ppid:6350 task_flags:0x400040 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5325 [inline] __schedule+0x1190/0x5de0 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:7026 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083 rwsem_down_write_slowpath+0x521/0x1310 kernel/locking/rwsem.c:1185 __down_write_common kernel/locking/rwsem.c:1317 [inline] __down_write kernel/locking/rwsem.c:1326 [inline] down_write+0x1d6/0x200 kernel/locking/rwsem.c:1591 inode_lock include/linux/fs.h:980 [inline] blkdev_fallocate+0x24c/0x430 block/fops.c:911 vfs_fallocate+0x5b4/0x10e0 fs/open.c:342 ksys_fallocate fs/open.c:366 [inline] __do_sys_fallocate fs/open.c:371 [inline] __se_sys_fallocate fs/open.c:369 [inline] __x64_sys_fallocate+0xd5/0x150 fs/open.c:369 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7facf277fed9 RSP: 002b:00007facf361a058 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007facf2945fa0 RCX: 00007facf277fed9 RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000004 RBP: 00007facf27f3cc8 R08: 0000000000000000 R09: 0000000000000000 R10: 7fffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007facf2945fa0 R15: 00007ffd0b557e58 INFO: task syz.2.17:6683 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.17 state:D stack:28856 pid:6683 tgid:6682 ppid:6354 task_flags:0x400040 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5325 [inline] __schedule+0x1190/0x5de0 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:7026 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083 rwsem_down_write_slowpath+0x521/0x1310 kernel/locking/rwsem.c:1185 __down_write_common kernel/locking/rwsem.c:1317 [inline] __down_write kernel/locking/rwsem.c:1326 [inline] down_write+0x1d6/0x200 kernel/locking/rwsem.c:1591 inode_lock include/linux/fs.h:980 [inline] blkdev_fallocate+0x24c/0x430 block/fops.c:911 vfs_fallocate+0x5b4/0x10e0 fs/open.c:342 ksys_fallocate fs/open.c:366 [inline] __do_sys_fallocate fs/open.c:371 [inline] __se_sys_fallocate fs/open.c:369 [inline] __x64_sys_fallocate+0xd5/0x150 fs/open.c:369 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff200f7fed9 RSP: 002b:00007ff201dc6058 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007ff201145fa0 RCX: 00007ff200f7fed9 RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000004 RBP: 00007ff200ff3cc8 R08: 0000000000000000 R09: 0000000000000000 R10: 7fffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ff201145fa0 R15: 00007ffdf6afded8 INFO: task syz.4.19:6688 blocked for more than 144 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.19 state:D stack:27624 pid:6688 tgid:6686 ppid:6364 task_flags:0x400040 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5325 [inline] __schedule+0x1190/0x5de0 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:7026 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083 rwsem_down_write_slowpath+0x521/0x1310 kernel/locking/rwsem.c:1185 __down_write_common kernel/locking/rwsem.c:1317 [inline] __down_write kernel/locking/rwsem.c:1326 [inline] down_write+0x1d6/0x200 kernel/locking/rwsem.c:1591 inode_lock include/linux/fs.h:980 [inline] blkdev_fallocate+0x24c/0x430 block/fops.c:911 vfs_fallocate+0x5b4/0x10e0 fs/open.c:342 ksys_fallocate fs/open.c:366 [inline] __do_sys_fallocate fs/open.c:371 [inline] __se_sys_fallocate fs/open.c:369 [inline] __x64_sys_fallocate+0xd5/0x150 fs/open.c:369 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb64c37fed9 RSP: 002b:00007fb64d213058 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007fb64c545fa0 RCX: 00007fb64c37fed9 RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000004 RBP: 00007fb64c3f3cc8 R08: 0000000000000000 R09: 0000000000000000 R10: 7fffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fb64c545fa0 R15: 00007ffcc07c3468 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffffffff8e3c4460 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8e3c4460 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline] #0: ffffffff8e3c4460 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6775 3 locks held by kworker/0:1H/124: #0: ffff8880b843a398 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:638 #1: ffff8880b8424088 (psi_seq){-.-.}-{0:0}, at: psi_sched_switch kernel/sched/stats.h:220 [inline] #1: ffff8880b8424088 (psi_seq){-.-.}-{0:0}, at: __schedule+0x1861/0x5de0 kernel/sched/core.c:6923 #2: ffffffff8e3c4460 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #2: ffffffff8e3c4460 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline] #2: ffffffff8e3c4460 (rcu_read_lock){....}-{1:3}, at: blk_mq_run_work_fn+0x1c2/0x380 block/blk-mq.c:2543 2 locks held by getty/5566: #0: ffff88814c95b0a0 (&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 2 locks held by syz.3.18/6605: 1 lock held by syz.0.15/6645: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.1.16/6664: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.2.17/6683: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.4.19/6688: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.5.20/6855: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.6.21/6898: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.7.22/6910: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.8.23/6912: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.9.24/6914: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.3.25/6939: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.0.26/7007: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.1.27/7017: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.2.28/7025: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.4.29/7027: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.5.30/7061: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.6.31/7165: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.7.32/7167: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.8.33/7169: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.9.34/7171: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.3.35/7192: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.1.37/7278: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.0.36/7290: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.2.38/7304: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.4.39/7311: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.5.40/7313: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.6.41/7431: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.7.42/7435: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.3.45/7452: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.8.43/7454: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.9.44/7456: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.0.46/7559: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.1.47/7564: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.2.48/7575: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.4.50/7577: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.5.49/7579: #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c37aa8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 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:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:332 [inline] watchdog+0xf3f/0x1170 kernel/hung_task.c:495 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 68 Comm: kworker/u8:5 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet RIP: 0010:debug_lockdep_rcu_enabled+0x28/0x40 kernel/rcu/update.c:320 Code: 90 90 f3 0f 1e fa 8b 05 76 6d 1c 05 85 c0 74 20 8b 05 00 9d 1c 05 85 c0 74 16 65 48 8b 05 b8 d8 3d 08 8b 80 2c 0b 00 00 85 c0 <0f> 94 c0 0f b6 c0 c3 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 0f RSP: 0018:ffffc90000007440 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000002 RCX: 00000000c639c71c RDX: 0000000000000000 RSI: ffffffff8dadd969 RDI: ffffffff8bf1dec0 RBP: ffffc90000007508 R08: f501fefe41178ce3 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff81a841e0 R13: ffffc900000074c0 R14: 0000000000000000 R15: ffff88801d7ba480 FS: 0000000000000000(0000) GS:ffff8881249d8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000559a4e709be0 CR3: 000000000e182000 CR4: 00000000003526f0 Call Trace: rcu_read_lock include/linux/rcupdate.h:868 [inline] class_rcu_constructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0xd6/0x20a0 arch/x86/kernel/unwind_orc.c:479 arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56 kasan_save_track+0x14/0x30 mm/kasan/common.c:77 __kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:587 kasan_save_free_info mm/kasan/kasan.h:406 [inline] poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2530 [inline] slab_free mm/slub.c:6619 [inline] kfree+0x2b8/0x6d0 mm/slub.c:6826 skb_kfree_head net/core/skbuff.c:1048 [inline] skb_free_head+0x114/0x210 net/core/skbuff.c:1060 skb_release_data+0x795/0x9e0 net/core/skbuff.c:1087 skb_release_all net/core/skbuff.c:1152 [inline] __kfree_skb net/core/skbuff.c:1166 [inline] sk_skb_reason_drop+0x129/0x1a0 net/core/skbuff.c:1204 kfree_skb_reason include/linux/skbuff.h:1322 [inline] __netif_receive_skb_core.constprop.0+0x57a/0x4bd0 net/core/dev.c:6053 __netif_receive_skb_one_core+0xb0/0x1e0 net/core/dev.c:6077 __netif_receive_skb+0x1d/0x160 net/core/dev.c:6192 process_backlog+0x439/0x15e0 net/core/dev.c:6544 __napi_poll.constprop.0+0xba/0x550 net/core/dev.c:7594 napi_poll net/core/dev.c:7657 [inline] net_rx_action+0x97f/0xef0 net/core/dev.c:7784 handle_softirqs+0x219/0x8e0 kernel/softirq.c:622 do_softirq kernel/softirq.c:523 [inline] do_softirq+0xb2/0xf0 kernel/softirq.c:510 __local_bh_enable_ip+0x100/0x120 kernel/softirq.c:450 local_bh_enable include/linux/bottom_half.h:33 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:936 [inline] __dev_queue_xmit+0xb06/0x4490 net/core/dev.c:4790 dev_queue_xmit include/linux/netdevice.h:3365 [inline] batadv_send_skb_packet+0x548/0x6f0 net/batman-adv/send.c:100 batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:391 [inline] batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:419 [inline] batadv_iv_send_outstanding_bat_ogm_packet+0x734/0x920 net/batman-adv/bat_iv_ogm.c:1697 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3263 process_scheduled_works kernel/workqueue.c:3346 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3427 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245