INFO: task klogd:4508 blocked for more than 143 seconds. Not tainted 6.8.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:klogd state:D stack:23800 pid:4508 tgid:4508 ppid:1 flags:0x00004002 Call Trace: context_switch kernel/sched/core.c:5400 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0x149/0x260 kernel/sched/core.c:6817 wait_for_unix_gc+0x150/0x210 net/unix/garbage.c:201 unix_dgram_sendmsg+0x11a/0x2200 net/unix/af_unix.c:1924 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x223/0x270 net/socket.c:745 __sys_sendto+0x3a4/0x4f0 net/socket.c:2191 __do_sys_sendto net/socket.c:2203 [inline] __se_sys_sendto net/socket.c:2199 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2199 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7fb3791899b5 RSP: 002b:00007fff99a134d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fb3791899b5 RDX: 000000000000004a RSI: 000056079ba5bac0 RDI: 0000000000000003 RBP: 000056079ba54910 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000004000 R11: 0000000000000246 R12: 0000000000000013 R13: 00007fb379317212 R14: 00007fff99a135d8 R15: 0000000000000000 INFO: task udevd:4151 blocked for more than 144 seconds. Not tainted 6.8.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:udevd state:D stack:23728 pid:4151 tgid:4151 ppid:4519 flags:0x00004002 Call Trace: context_switch kernel/sched/core.c:5400 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0x149/0x260 kernel/sched/core.c:6817 wait_for_unix_gc+0x150/0x210 net/unix/garbage.c:201 unix_dgram_sendmsg+0x11a/0x2200 net/unix/af_unix.c:1924 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x223/0x270 net/socket.c:745 sock_write_iter+0x2dd/0x400 net/socket.c:1160 call_write_iter include/linux/fs.h:2085 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0xa83/0xcb0 fs/read_write.c:590 ksys_write+0x1a0/0x2c0 fs/read_write.c:643 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7fd92c396bf2 RSP: 002b:00007ffc870a89a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd92c396bf2 RDX: 0000000000000000 RSI: 00007ffc870a89ff RDI: 000000000000000a RBP: 00007ffc870a89ff R08: 0000000000000001 R09: 0000000000000000 R10: 000000000000010f R11: 0000000000000246 R12: 000000000000000a R13: 00007fd92c2c0ae0 R14: 0000000000000000 R15: 0000558056cde910 INFO: task udevd:4245 blocked for more than 144 seconds. Not tainted 6.8.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:udevd state:D stack:24216 pid:4245 tgid:4245 ppid:4519 flags:0x00004002 Call Trace: context_switch kernel/sched/core.c:5400 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0x149/0x260 kernel/sched/core.c:6817 wait_for_unix_gc+0x150/0x210 net/unix/garbage.c:201 unix_dgram_sendmsg+0x11a/0x2200 net/unix/af_unix.c:1924 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x223/0x270 net/socket.c:745 sock_write_iter+0x2dd/0x400 net/socket.c:1160 call_write_iter include/linux/fs.h:2085 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0xa83/0xcb0 fs/read_write.c:590 ksys_write+0x1a0/0x2c0 fs/read_write.c:643 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7fd92c396bf2 RSP: 002b:00007ffc870a89a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd92c396bf2 RDX: 0000000000000000 RSI: 00007ffc870a89ff RDI: 000000000000000a RBP: 00007ffc870a89ff R08: 0000000000000001 R09: d6a2234fcf721b09 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000a R13: 00007fd92c2c0ae0 R14: 0000000000000000 R15: 0000558056cde910 INFO: task udevd:14259 blocked for more than 145 seconds. Not tainted 6.8.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:udevd state:D stack:24216 pid:14259 tgid:14259 ppid:4519 flags:0x00004002 Call Trace: context_switch kernel/sched/core.c:5400 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0x149/0x260 kernel/sched/core.c:6817 wait_for_unix_gc+0x150/0x210 net/unix/garbage.c:201 unix_dgram_sendmsg+0x11a/0x2200 net/unix/af_unix.c:1924 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x223/0x270 net/socket.c:745 sock_write_iter+0x2dd/0x400 net/socket.c:1160 call_write_iter include/linux/fs.h:2085 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0xa83/0xcb0 fs/read_write.c:590 ksys_write+0x1a0/0x2c0 fs/read_write.c:643 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7fd92c396bf2 RSP: 002b:00007ffc870a89a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd92c396bf2 RDX: 0000000000000000 RSI: 00007ffc870a89ff RDI: 000000000000000a RBP: 00007ffc870a89ff R08: 0000000000000001 R09: d6a2234fcf721b09 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000a R13: 00007fd92c2c0ae0 R14: 0000000000000000 R15: 0000558056cde910 INFO: task udevd:16967 blocked for more than 145 seconds. Not tainted 6.8.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:udevd state:D stack:23536 pid:16967 tgid:16967 ppid:4519 flags:0x00004002 Call Trace: context_switch kernel/sched/core.c:5400 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0x149/0x260 kernel/sched/core.c:6817 wait_for_unix_gc+0x150/0x210 net/unix/garbage.c:201 unix_dgram_sendmsg+0x11a/0x2200 net/unix/af_unix.c:1924 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x223/0x270 net/socket.c:745 sock_write_iter+0x2dd/0x400 net/socket.c:1160 call_write_iter include/linux/fs.h:2085 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0xa83/0xcb0 fs/read_write.c:590 ksys_write+0x1a0/0x2c0 fs/read_write.c:643 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7fd92c396bf2 RSP: 002b:00007ffc870a89a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd92c396bf2 RDX: 0000000000000000 RSI: 00007ffc870a89ff RDI: 000000000000000a RBP: 00007ffc870a89ff R08: 0000000000000001 R09: 0000000000000000 R10: 000000000000010f R11: 0000000000000246 R12: 000000000000000a R13: 00007fd92c2c0ae0 R14: 0000000000000000 R15: 0000558056cde910 INFO: task syz-executor.1:26623 blocked for more than 146 seconds. Not tainted 6.8.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:26032 pid:26623 tgid:26617 ppid:5099 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5400 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0x149/0x260 kernel/sched/core.c:6817 wait_for_unix_gc+0x150/0x210 net/unix/garbage.c:201 unix_dgram_sendmsg+0x11a/0x2200 net/unix/af_unix.c:1924 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x223/0x270 net/socket.c:745 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f310c47dda9 RSP: 002b:00007f310d2050c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f310c5abf80 RCX: 00007f310c47dda9 RDX: 0000000000000000 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 00007f310c4ca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f310c5abf80 R15: 00007ffdfd8c3038 INFO: task syz-executor.4:26619 blocked for more than 146 seconds. Not tainted 6.8.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:27608 pid:26619 tgid:26618 ppid:5112 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5400 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0x149/0x260 kernel/sched/core.c:6817 wait_for_unix_gc+0x150/0x210 net/unix/garbage.c:201 unix_dgram_sendmsg+0x11a/0x2200 net/unix/af_unix.c:1924 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x223/0x270 net/socket.c:745 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmmsg+0x3b2/0x740 net/socket.c:2724 __do_sys_sendmmsg net/socket.c:2753 [inline] __se_sys_sendmmsg net/socket.c:2750 [inline] __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2750 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7fccc9a7dda9 RSP: 002b:00007fccca78c0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007fccc9babf80 RCX: 00007fccc9a7dda9 RDX: 0000000000000318 RSI: 00000000200bd000 RDI: 0000000000000005 RBP: 00007fccc9aca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fccc9babf80 R15: 00007ffcd2d65158 INFO: task syz-executor.5:26634 blocked for more than 147 seconds. Not tainted 6.8.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:26512 pid:26634 tgid:26632 ppid:5105 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5400 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0x149/0x260 kernel/sched/core.c:6817 wait_for_unix_gc+0x150/0x210 net/unix/garbage.c:201 unix_stream_sendmsg+0xd2/0x1230 net/unix/af_unix.c:2200 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x223/0x270 net/socket.c:745 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f1f0427dda9 RSP: 002b:00007f1f04f390c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f1f043abf80 RCX: 00007f1f0427dda9 RDX: 0000000000000001 RSI: 00000000200002c0 RDI: 0000000000000006 RBP: 00007f1f042ca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f1f043abf80 R15: 00007ffe33e06428 INFO: task syz-executor.5:26637 blocked for more than 148 seconds. Not tainted 6.8.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:28432 pid:26637 tgid:26632 ppid:5105 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5400 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0x149/0x260 kernel/sched/core.c:6817 wait_for_unix_gc+0x150/0x210 net/unix/garbage.c:201 unix_dgram_sendmsg+0x11a/0x2200 net/unix/af_unix.c:1924 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x223/0x270 net/socket.c:745 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f1f0427dda9 RSP: 002b:00007f1f035ff0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f1f043ac120 RCX: 00007f1f0427dda9 RDX: 0000000000040001 RSI: 0000000020001c40 RDI: 0000000000000004 RBP: 00007f1f042ca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f1f043ac120 R15: 00007ffe33e06428 INFO: task syz-executor.0:26645 blocked for more than 148 seconds. Not tainted 6.8.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:27568 pid:26645 tgid:26642 ppid:5098 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5400 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0x149/0x260 kernel/sched/core.c:6817 wait_for_unix_gc+0x150/0x210 net/unix/garbage.c:201 unix_stream_sendmsg+0xd2/0x1230 net/unix/af_unix.c:2200 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x223/0x270 net/socket.c:745 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f055707dda9 RSP: 002b:00007f0557e210c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f05571ac050 RCX: 00007f055707dda9 RDX: 0000000000000000 RSI: 0000000020000d00 RDI: 0000000000000003 RBP: 00007f05570ca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f05571ac050 R15: 00007ffea5212c78 Future hung task reports are suppressed, see sysctl kernel.hung_task_warnings Showing all locks held in the system: 1 lock held by khungtaskd/28: #0: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline] #0: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline] #0: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614 2 locks held by getty/4823: #0: ffff88802b7090a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000311b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b4/0x1e10 drivers/tty/n_tty.c:2201 2 locks held by kworker/u4:4/27635: 1 lock held by syz-executor.3/26606: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.8.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x320 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+0xfaf/0xff0 kernel/hung_task.c:379 kthread+0x2f1/0x390 kernel/kthread.c:388 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 26606 Comm: syz-executor.3 Not tainted 6.8.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 RIP: 0010:list_empty include/linux/list.h:373 [inline] RIP: 0010:unix_gc+0x105a/0x1330 net/unix/garbage.c:318 Code: 48 89 df e8 88 4b ec f7 48 c7 03 00 00 00 00 4c 89 f7 be 02 00 00 00 e8 24 f5 2d ff eb 05 e8 1d 2d 8a f7 48 8b 1d 46 58 3e 05 <4c> 39 fb 74 07 e8 0c 2d 8a f7 eb 85 e8 05 2d 8a f7 eb 05 e8 fe 2c RSP: 0018:ffffc90005007b80 EFLAGS: 00000293 RAX: ffffffff8a093fd3 RBX: ffff888087b14640 RCX: ffff888028878000 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 RBP: ffffc90005007cf0 R08: ffffffff893736ed R09: 1ffff11006097d0c R10: dffffc0000000000 R11: ffffed1006097d0d R12: 1ffff11010f628ee R13: ffffc90005007be0 R14: 0000000000000000 R15: ffffffff8f479820 FS: 0000555555a52480(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc2b9e0a440 CR3: 00000000306d0000 CR4: 0000000000350ef0 Call Trace: unix_release_sock+0xadd/0xd20 net/unix/af_unix.c:683 unix_release+0x91/0xc0 net/unix/af_unix.c:1064 __sock_release net/socket.c:659 [inline] sock_close+0xbe/0x240 net/socket.c:1421 __fput+0x42b/0x8a0 fs/file_table.c:376 __do_sys_close fs/open.c:1554 [inline] __se_sys_close fs/open.c:1539 [inline] __x64_sys_close+0x7e/0x110 fs/open.c:1539 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f988607cc9a Code: 48 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 03 7f 02 00 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 89 d7 89 44 24 0c e8 63 7f 02 00 8b 44 24 RSP: 002b:00007ffe723cceb0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f988607cc9a RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000000032 R08: 0000001b32720000 R09: 00000000000002cd R10: 000000008135d94f R11: 0000000000000293 R12: 00007f9885c00258 R13: ffffffffffffffff R14: 00007f9885c00000 R15: 000000000020a75c