INFO: task syz-executor.3:17503 blocked for more than 159 seconds.
Not tainted 6.2.0-rc3-next-20230109-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3 state:D stack:28040 pid:17503 ppid:5107 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5252 [inline]
__schedule+0x25d0/0x5a70 kernel/sched/core.c:6570
schedule+0xde/0x1b0 kernel/sched/core.c:6646
rwsem_down_read_slowpath+0x5a7/0xb20 kernel/locking/rwsem.c:1095
__down_read_common kernel/locking/rwsem.c:1260 [inline]
__down_read kernel/locking/rwsem.c:1269 [inline]
down_read+0xe6/0x450 kernel/locking/rwsem.c:1511
mmap_read_lock include/linux/mmap_lock.h:117 [inline]
do_user_addr_fault+0xa51/0x1210 arch/x86/mm/fault.c:1379
handle_page_fault arch/x86/mm/fault.c:1519 [inline]
exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1575
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0033:0x7f2176e276c6
RSP: 002b:00007ffe03b89308 EFLAGS: 00010287
RAX: 0000001b32722000 RBX: 00007f2176fac018 RCX: 0000001b32720000
RDX: 0000001b32722004 RSI: 0000001b32721970 RDI: 0000000030e6956a
RBP: 0000000030e6956a R08: 0000001b32b20000 R09: 0000000030e6956e
R10: 00007ffe03bdd090 R11: 000000000001eac6 R12: 00007f2176fa0000
R13: 0000000000000001 R14: 0000000000003406 R15: ffffffff81663872
Showing all threads with locks held in the system:
task:rcu_tasks_kthre state:I stack:29056 pid:12 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5252 [inline]
__schedule+0x25d0/0x5a70 kernel/sched/core.c:6570
schedule+0xde/0x1b0 kernel/sched/core.c:6646
rcu_tasks_one_gp+0x484/0xcd0 kernel/rcu/tasks.h:517
rcu_tasks_kthread+0x77/0xa0 kernel/rcu/tasks.h:555
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8c7929f0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xcd0 kernel/rcu/tasks.h:510
task:rcu_tasks_trace state:I stack:29224 pid:13 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5252 [inline]
__schedule+0x25d0/0x5a70 kernel/sched/core.c:6570
schedule+0xde/0x1b0 kernel/sched/core.c:6646
rcu_tasks_one_gp+0x484/0xcd0 kernel/rcu/tasks.h:517
rcu_tasks_kthread+0x77/0xa0 kernel/rcu/tasks.h:555
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8c7926f0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xcd0 kernel/rcu/tasks.h:510
task:getty state:S stack:23336 pid:4750 ppid:1 flags:0x00000000
Call Trace:
context_switch kernel/sched/core.c:5252 [inline]
__schedule+0x25d0/0x5a70 kernel/sched/core.c:6570
schedule+0xde/0x1b0 kernel/sched/core.c:6646
schedule_timeout+0x1e1/0x2a0 kernel/time/timer.c:2143
wait_woken+0x197/0x200 kernel/sched/wait.c:463
n_tty_read+0x1055/0x13e0 drivers/tty/n_tty.c:2243
iterate_tty_read drivers/tty/tty_io.c:852 [inline]
tty_read+0x30e/0x5a0 drivers/tty/tty_io.c:927
call_read_iter include/linux/fs.h:2185 [inline]
new_sync_read fs/read_write.c:389 [inline]
vfs_read+0x681/0x930 fs/read_write.c:470
ksys_read+0x12b/0x250 fs/read_write.c:613
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f3f07b368fe
RSP: 002b:00007ffd3338a4a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 000055642c350910 RCX: 00007f3f07b368fe
RDX: 0000000000000001 RSI: 00007ffd3338a4c0 RDI: 0000000000000000
RBP: 000055642c350970 R08: 0000000000000007 R09: 000055642c351cd0
R10: 0000000000000063 R11: 0000000000000246 R12: 000055642c3509ac
R13: 00007ffd3338a4c0 R14: 0000000000000000 R15: 000055642c3509ac
2 locks held by getty/4750:
#0: ffff88802bc6a098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x26/0x80 drivers/tty/tty_ldisc.c:244
#1: ffffc900015902f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef4/0x13e0 drivers/tty/n_tty.c:2177
task:syz-executor.1 state:D stack:23808 pid:5124 ppid:5102 flags:0x00000000
Call Trace:
context_switch kernel/sched/core.c:5252 [inline]
__schedule+0x25d0/0x5a70 kernel/sched/core.c:6570
schedule+0xde/0x1b0 kernel/sched/core.c:6646
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6705
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0xa48/0x1360 kernel/locking/mutex.c:747
exp_funnel_lock kernel/rcu/tree_exp.h:325 [inline]
synchronize_rcu_expedited+0x400/0x770 kernel/rcu/tree_exp.h:990
namespace_unlock+0x1af/0x410 fs/namespace.c:1602
do_umount fs/namespace.c:1825 [inline]
path_umount+0x67b/0x10b0 fs/namespace.c:1907
ksys_umount fs/namespace.c:1930 [inline]
__do_sys_umount fs/namespace.c:1935 [inline]
__se_sys_umount fs/namespace.c:1933 [inline]
__x64_sys_umount+0x15d/0x190 fs/namespace.c:1933
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f35d1a8d537
RSP: 002b:00007ffcdbe913c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f35d1a8d537
RDX: 00007ffcdbe9149b RSI: 000000000000000a RDI: 00007ffcdbe91490
RBP: 00007ffcdbe91490 R08: 00000000ffffffff R09: 00007ffcdbe91260
R10: 00005555567a98b3 R11: 0000000000000246 R12: 00007f35d1ae6b24
R13: 00007ffcdbe92550 R14: 00005555567a9810 R15: 00007ffcdbe92590
1 lock held by syz-executor.1/5124:
#0: ffffffff8c79e6b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:325 [inline]
#0: ffffffff8c79e6b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x400/0x770 kernel/rcu/tree_exp.h:990
task:kworker/1:8 state:D stack:26568 pid:5302 ppid:2 flags:0x00004000
Workqueue: rcu_gp wait_rcu_exp_gp
Call Trace:
context_switch kernel/sched/core.c:5252 [inline]
__schedule+0x25d0/0x5a70 kernel/sched/core.c:6570
schedule+0xde/0x1b0 kernel/sched/core.c:6646
schedule_timeout+0x14e/0x2a0 kernel/time/timer.c:2167
synchronize_rcu_expedited_wait_once kernel/rcu/tree_exp.h:572 [inline]
synchronize_rcu_expedited_wait kernel/rcu/tree_exp.h:624 [inline]
rcu_exp_wait_wake+0x28f/0x11c0 kernel/rcu/tree_exp.h:693
process_one_work+0x9bf/0x1750 kernel/workqueue.c:2293
worker_thread+0x669/0x1090 kernel/workqueue.c:2440
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
2 locks held by kworker/1:8/5302:
#0: ffff888012472538
(
(wq_completion)rcu_gp
){+.+.}-{0:0}
, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
, at: set_work_data kernel/workqueue.c:636 [inline]
, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline]
, at: process_one_work+0x86d/0x1750 kernel/workqueue.c:2264
#1:
ffffc900058ffda8
(
(work_completion)(&rew->rew_work)
){+.+.}-{0:0}
, at: process_one_work+0x8a1/0x1750 kernel/workqueue.c:2268
task:syz-executor.3 state:D
stack:28040 pid:17503 ppid:5107 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5252 [inline]
__schedule+0x25d0/0x5a70 kernel/sched/core.c:6570
schedule+0xde/0x1b0 kernel/sched/core.c:6646
rwsem_down_read_slowpath+0x5a7/0xb20 kernel/locking/rwsem.c:1095
__down_read_common kernel/locking/rwsem.c:1260 [inline]
__down_read kernel/locking/rwsem.c:1269 [inline]
down_read+0xe6/0x450 kernel/locking/rwsem.c:1511
mmap_read_lock include/linux/mmap_lock.h:117 [inline]
do_user_addr_fault+0xa51/0x1210 arch/x86/mm/fault.c:1379
handle_page_fault arch/x86/mm/fault.c:1519 [inline]
exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1575
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0033:0x7f2176e276c6
RSP: 002b:00007ffe03b89308 EFLAGS: 00010287
RAX: 0000001b32722000 RBX: 00007f2176fac018 RCX: 0000001b32720000
RDX: 0000001b32722004 RSI: 0000001b32721970 RDI: 0000000030e6956a
RBP: 0000000030e6956a R08: 0000001b32b20000 R09: 0000000030e6956e
R10: 00007ffe03bdd090 R11: 000000000001eac6 R12: 00007f2176fa0000
R13: 0000000000000001 R14: 0000000000003406 R15: ffffffff81663872
1 lock held by syz-executor.3/17503:
#0: ffff88807662d298 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:117 [inline]
#0: ffff88807662d298 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0xa51/0x1210 arch/x86/mm/fault.c:1379
task:syz-executor.3 state:R running task stack:27224 pid:17505 ppid:5107 flags:0x0000400e
Call Trace:
5 locks held by syz-executor.3/17505:
task:syz-executor.4 state:D stack:25240 pid:18874 ppid:5120 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5252 [inline]
__schedule+0x25d0/0x5a70 kernel/sched/core.c:6570
schedule+0xde/0x1b0 kernel/sched/core.c:6646
synchronize_rcu_expedited+0x5e2/0x770 kernel/rcu/tree_exp.h:1005
namespace_unlock+0x1af/0x410 fs/namespace.c:1602
drop_collected_mounts fs/namespace.c:2089 [inline]
put_mnt_ns fs/namespace.c:4554 [inline]
put_mnt_ns+0x10a/0x150 fs/namespace.c:4550
mount_subtree+0x23e/0x480 fs/namespace.c:3658
mount_subvol fs/btrfs/super.c:1384 [inline]
btrfs_mount+0x27c/0xa90 fs/btrfs/super.c:1612
legacy_get_tree+0x109/0x220 fs/fs_context.c:610
vfs_get_tree+0x8d/0x2f0 fs/super.c:1489
do_new_mount fs/namespace.c:3145 [inline]
path_mount+0x132a/0x1e20 fs/namespace.c:3475
do_mount fs/namespace.c:3488 [inline]
__do_sys_mount fs/namespace.c:3697 [inline]
__se_sys_mount fs/namespace.c:3674 [inline]
__x64_sys_mount+0x283/0x300 fs/namespace.c:3674
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fe3e908d5fa
RSP: 002b:00007fe3e9ed7f88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00000000000051ab RCX: 00007fe3e908d5fa
RDX: 00000000200051c0 RSI: 0000000020000080 RDI: 00007fe3e9ed7fe0
RBP: 00007fe3e9ed8020 R08: 00007fe3e9ed8020 R09: 0000000001000010
R10: 0000000001000010 R11: 0000000000000202 R12: 00000000200051c0
R13: 0000000020000080 R14: 00007fe3e9ed7fe0 R15: 00000000200000c0
1 lock held by syz-executor.4/18874:
#0: ffffffff8c79e6b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:293 [inline]
#0: ffffffff8c79e6b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x658/0x770 kernel/rcu/tree_exp.h:990
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.2.0-rc3-next-20230109-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x24/0x18a lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x32f/0x3c0 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+0xcae/0x1050 kernel/hung_task.c:377
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 18927 Comm: syz-executor.2 Not tainted 6.2.0-rc3-next-20230109-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x11/0x70 kernel/kcov.c:207
Code: a8 01 00 00 e8 b0 ff ff ff 31 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 65 8b 05 2d 0b 82 7e 89 c1 48 8b 34 24 <81> e1 00 01 00 00 65 48 8b 14 25 80 b8 03 00 a9 00 01 ff 00 74 0e
RSP: 0018:ffffc9000bb4f6c8 EFLAGS: 00000282
RAX: 0000000080000001 RBX: ffffc9000bb4fac0 RCX: 0000000080000001
RDX: 0000000000001000 RSI: ffffffff81bf7a19 RDI: ffffc9000bb4fac0
RBP: 00007f5bfad44000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000000 R12: ffffea0000758b80
R13: 0000000000000001 R14: ffffea0000758b80 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32522000 CR3: 000000003b7e0000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__tlb_remove_page_size+0x19/0x480 mm/mmu_gather.c:122
__tlb_remove_page include/asm-generic/tlb.h:472 [inline]
zap_pte_range mm/memory.c:1414 [inline]
zap_pmd_range mm/memory.c:1534 [inline]
zap_pud_range mm/memory.c:1563 [inline]
zap_p4d_range mm/memory.c:1584 [inline]
unmap_page_range+0x124c/0x3cc0 mm/memory.c:1605
unmap_single_vma+0x190/0x2a0 mm/memory.c:1651
unmap_vmas+0x226/0x370 mm/memory.c:1690
exit_mmap+0x18d/0x7c0 mm/mmap.c:3080
__mmput+0x128/0x4c0 kernel/fork.c:1209
mmput+0x60/0x70 kernel/fork.c:1231
exit_mm kernel/exit.c:563 [inline]
do_exit+0x9ac/0x2a90 kernel/exit.c:854
do_group_exit+0xd4/0x2a0 kernel/exit.c:1012
get_signal+0x225f/0x24f0 kernel/signal.c:2859
arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306
exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297
do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f5bfb28c0c9
Code: Unable to access opcode bytes at 0x7f5bfb28c09f.
RSP: 002b:00007f5bfbf9c218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f5bfb3abf88 RCX: 00007f5bfb28c0c9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f5bfb3abf88
RBP: 00007f5bfb3abf80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5bfb3abf8c
R13: 00007ffdab838fff R14: 00007f5bfbf9c300 R15: 0000000000022000