INFO: task syz.0.17:6553 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.17 state:D stack:16936 pid:6553 tgid:6552 ppid:6380 task_flags:0x400140 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x16f3/0x4c20 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
io_schedule+0x81/0xe0 kernel/sched/core.c:7903
folio_wait_bit_common+0x6b5/0xb90 mm/filemap.c:1317
folio_lock include/linux/pagemap.h:1133 [inline]
truncate_inode_pages_range+0x88d/0xb90 mm/truncate.c:433
truncate_inode_pages mm/truncate.c:460 [inline]
truncate_pagecache mm/truncate.c:769 [inline]
truncate_setsize+0xcf/0xf0 mm/truncate.c:794
bchfs_truncate+0x622/0xc20 fs/bcachefs/fs-io.c:488
notify_change+0xb31/0xe60 fs/attr.c:552
do_truncate+0x1a4/0x220 fs/open.c:68
handle_truncate fs/namei.c:3508 [inline]
do_open fs/namei.c:3891 [inline]
path_openat+0x3078/0x3840 fs/namei.c:4046
do_filp_open+0x1fa/0x410 fs/namei.c:4073
do_sys_openat2+0x121/0x1c0 fs/open.c:1435
do_sys_open fs/open.c:1450 [inline]
__do_sys_open fs/open.c:1458 [inline]
__se_sys_open fs/open.c:1454 [inline]
__x64_sys_open+0x11e/0x150 fs/open.c:1454
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7febf511ebe9
RSP: 002b:00007febf4786038 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007febf5345fa0 RCX: 00007febf511ebe9
RDX: 0000000000000040 RSI: 0000000000141242 RDI: 0000200000000140
RBP: 00007febf51a1e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007febf5346038 R14: 00007febf5345fa0 R15: 00007ffe50de1fa8
INFO: task syz.0.17:6566 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.17 state:D stack:19784 pid:6566 tgid:6552 ppid:6380 task_flags:0x440140 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x16f3/0x4c20 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
__bch2_two_state_lock+0x1ea/0x370 fs/bcachefs/two_state_shared_lock.c:7
bch2_two_state_lock fs/bcachefs/two_state_shared_lock.h:55 [inline]
bch2_readahead+0x94f/0x1100 fs/bcachefs/fs-io-buffered.c:296
read_pages+0x17a/0x580 mm/readahead.c:160
page_cache_ra_unbounded+0x63b/0x740 mm/readahead.c:297
filemap_readahead mm/filemap.c:2572 [inline]
filemap_get_pages+0xaed/0x1df0 mm/filemap.c:2617
filemap_splice_read+0x587/0xc60 mm/filemap.c:2991
do_splice_read fs/splice.c:982 [inline]
splice_direct_to_actor+0x4b1/0xcd0 fs/splice.c:1086
do_splice_direct_actor fs/splice.c:1204 [inline]
do_splice_direct+0x187/0x270 fs/splice.c:1230
do_sendfile+0x4ec/0x7f0 fs/read_write.c:1370
__do_sys_sendfile64 fs/read_write.c:1431 [inline]
__se_sys_sendfile64+0x13e/0x190 fs/read_write.c:1417
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7febf511ebe9
RSP: 002b:00007febf4765038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007febf5346090 RCX: 00007febf511ebe9
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000005
RBP: 00007febf51a1e19 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000e0000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007febf5346128 R14: 00007febf5346090 R15: 00007ffe50de1fa8
INFO: task syz.1.18:6591 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.18 state:D stack:17448 pid:6591 tgid:6590 ppid:6568 task_flags:0x440140 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x16f3/0x4c20 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
__bch2_two_state_lock+0x1ea/0x370 fs/bcachefs/two_state_shared_lock.c:7
bch2_two_state_lock fs/bcachefs/two_state_shared_lock.h:55 [inline]
bch2_readahead+0x94f/0x1100 fs/bcachefs/fs-io-buffered.c:296
read_pages+0x17a/0x580 mm/readahead.c:160
page_cache_ra_unbounded+0x63b/0x740 mm/readahead.c:297
filemap_readahead mm/filemap.c:2572 [inline]
filemap_get_pages+0xaed/0x1df0 mm/filemap.c:2617
filemap_splice_read+0x587/0xc60 mm/filemap.c:2991
do_splice_read fs/splice.c:982 [inline]
splice_direct_to_actor+0x4b1/0xcd0 fs/splice.c:1086
do_splice_direct_actor fs/splice.c:1204 [inline]
do_splice_direct+0x187/0x270 fs/splice.c:1230
do_sendfile+0x4ec/0x7f0 fs/read_write.c:1370
__do_sys_sendfile64 fs/read_write.c:1431 [inline]
__se_sys_sendfile64+0x13e/0x190 fs/read_write.c:1417
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f77c3daebe9
RSP: 002b:00007f77c341e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f77c3fd5fa0 RCX: 00007f77c3daebe9
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000005
RBP: 00007f77c3e31e19 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000e0000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f77c3fd6038 R14: 00007f77c3fd5fa0 R15: 00007ffddbfa1ac8
INFO: task syz.1.18:6603 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.18 state:D stack:25384 pid:6603 tgid:6590 ppid:6568 task_flags:0x400140 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x16f3/0x4c20 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
io_schedule+0x81/0xe0 kernel/sched/core.c:7903
folio_wait_bit_common+0x6b5/0xb90 mm/filemap.c:1317
folio_lock include/linux/pagemap.h:1133 [inline]
truncate_inode_pages_range+0x88d/0xb90 mm/truncate.c:433
truncate_inode_pages mm/truncate.c:460 [inline]
truncate_pagecache mm/truncate.c:769 [inline]
truncate_setsize+0xcf/0xf0 mm/truncate.c:794
bchfs_truncate+0x622/0xc20 fs/bcachefs/fs-io.c:488
notify_change+0xb31/0xe60 fs/attr.c:552
do_truncate+0x1a4/0x220 fs/open.c:68
handle_truncate fs/namei.c:3508 [inline]
do_open fs/namei.c:3891 [inline]
path_openat+0x3078/0x3840 fs/namei.c:4046
do_filp_open+0x1fa/0x410 fs/namei.c:4073
do_sys_openat2+0x121/0x1c0 fs/open.c:1435
do_sys_open fs/open.c:1450 [inline]
__do_sys_open fs/open.c:1458 [inline]
__se_sys_open fs/open.c:1454 [inline]
__x64_sys_open+0x11e/0x150 fs/open.c:1454
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f77c3daebe9
RSP: 002b:00007f77c33fd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f77c3fd6090 RCX: 00007f77c3daebe9
RDX: 0000000000000040 RSI: 0000000000141242 RDI: 0000200000000140
RBP: 00007f77c3e31e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f77c3fd6128 R14: 00007f77c3fd6090 R15: 00007ffddbfa1ac8
Showing all locks held in the system:
1 lock held by khungtaskd/38:
#0: ffffffff8d9a8bc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8d9a8bc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8d9a8bc0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
4 locks held by kworker/u8:2/43:
2 locks held by getty/5597:
#0: ffff88823bf328a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003e832e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x444/0x1410 drivers/tty/n_tty.c:2222
2 locks held by syz.0.17/6553:
#0: ffff888038efe488 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557
#1: ffff8880416489b8 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:875 [inline]
#1: ffff8880416489b8 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: do_truncate+0x171/0x220 fs/open.c:63
1 lock held by syz.0.17/6566:
#0: ffff888041648b88 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:935 [inline]
#0: ffff888041648b88 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0xf4/0x740 mm/readahead.c:228
1 lock held by syz.1.18/6591:
#0: ffff888041649c08 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:935 [inline]
#0: ffff888041649c08 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0xf4/0x740 mm/readahead.c:228
2 locks held by syz.1.18/6603:
#0: ffff88802768e488 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557
#1: ffff888041649a38 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:875 [inline]
#1: ffff888041649a38 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: do_truncate+0x171/0x220 fs/open.c:63
1 lock held by syz.2.39/6895:
#0: ffff88805c136648 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:935 [inline]
#0: ffff88805c136648 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0xf4/0x740 mm/readahead.c:228
2 locks held by syz.2.39/6906:
#0: ffff88805fe58488 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557
#1: ffff88805c136478 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:875 [inline]
#1: ffff88805c136478 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: do_truncate+0x171/0x220 fs/open.c:63
1 lock held by syz.3.53/7106:
#0: ffff88805c0b8b88 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:935 [inline]
#0: ffff88805c0b8b88 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0xf4/0x740 mm/readahead.c:228
2 locks held by syz.3.53/7117:
#0: ffff88803237e488 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557
#1: ffff88805c0b89b8 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:875 [inline]
#1: ffff88805c0b89b8 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: do_truncate+0x171/0x220 fs/open.c:63
1 lock held by syz.4.56/7173:
#0: ffff88805c136e88 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:935 [inline]
#0: ffff88805c136e88 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0xf4/0x740 mm/readahead.c:228
2 locks held by syz.4.56/7184:
#0: ffff888035cc6488 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557
#1: ffff88805c136cb8 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:875 [inline]
#1: ffff88805c136cb8 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: do_truncate+0x171/0x220 fs/open.c:63
2 locks held by syz.5.60/7254:
#0: ffff88803b3fc488 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557
#1: ffff88805c1353f8 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:875 [inline]
#1: ffff88805c1353f8 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: do_truncate+0x171/0x220 fs/open.c:63
1 lock held by syz.5.60/7266:
#0: ffff88805c1355c8 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:935 [inline]
#0: ffff88805c1355c8 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0xf4/0x740 mm/readahead.c:228
1 lock held by syz.6.61/7301:
#0: ffff88805c0bbd08 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:935 [inline]
#0: ffff88805c0bbd08 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0xf4/0x740 mm/readahead.c:228
2 locks held by syz.6.61/7312:
#0: ffff888027f00488 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557
#1: ffff88805c0bbb38 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:875 [inline]
#1: ffff88805c0bbb38 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: do_truncate+0x171/0x220 fs/open.c:63
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]
watchdog+0xf93/0xfe0 kernel/hung_task.c:491
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3f9/0x770 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: 43 Comm: kworker/u8:2 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: bat_events batadv_nc_worker
RIP: 0010:rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
RIP: 0010:rcu_read_lock include/linux/rcupdate.h:841 [inline]
RIP: 0010:batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
RIP: 0010:batadv_nc_worker+0x121/0xbc0 net/batman-adv/network-coding.c:719
Code: 59 f7 48 8b 44 24 20 48 8b 4c 24 38 48 8d 1c cd 00 00 00 00 48 03 18 e8 2d 77 e1 f6 48 8d 05 00 00 00 00 48 c7 c7 c0 8b 9a 8d <31> f6 31 d2 b9 02 00 00 00 45 31 c0 45 31 c9 48 89 44 24 10 50 e8
RSP: 0018:ffffc90000b479e8 EFLAGS: 00000283
RAX: ffffffff8ac44ada RBX: ffff88802498c610 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8d9a8bc0
RBP: ffffc90000b47c70 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffffff8ac449c0 R12: ffff88801988a000
R13: ffff8880313c4f00 R14: fffffffffffffd38 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8881269bf000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005616151ffa38 CR3: 000000000d7a6000 CR4: 00000000003526f0
Call Trace:
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245