INFO: task syz-executor:5818 blocked for more than 143 seconds.
Not tainted 6.15.0-rc4-syzkaller-00011-gf15d97df5afa #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:22760 pid:5818 tgid:5818 ppid:5816 task_flags:0x440100 flags:0x00000002
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x116f/0x5de0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
io_schedule+0xbf/0x130 kernel/sched/core.c:7742
bit_wait_io+0x15/0xe0 kernel/sched/wait_bit.c:247
__wait_on_bit+0x62/0x180 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0xd9/0x110 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x93d/0x12a0 fs/jbd2/transaction.c:1092
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1241
__ext4_journal_get_write_access+0x6a/0x340 fs/ext4/ext4_jbd2.c:241
ext4_reserve_inode_write+0x1be/0x320 fs/ext4/inode.c:5892
__ext4_mark_inode_dirty+0x197/0x870 fs/ext4/inode.c:6066
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:6103
__mark_inode_dirty+0x1eb/0xe50 fs/fs-writeback.c:2527
generic_update_time+0xcf/0xf0 fs/inode.c:2064
inode_update_time fs/inode.c:2077 [inline]
__file_update_time fs/inode.c:2305 [inline]
file_update_time+0x17d/0x1c0 fs/inode.c:2335
ext4_page_mkwrite+0x35e/0x1750 fs/ext4/inode.c:6221
do_page_mkwrite+0x171/0x380 mm/memory.c:3287
wp_page_shared mm/memory.c:3688 [inline]
do_wp_page+0xb9e/0x58e0 mm/memory.c:3907
handle_pte_fault mm/memory.c:6013 [inline]
__handle_mm_fault+0x1ada/0x2a40 mm/memory.c:6140
handle_mm_fault+0x3fe/0xad0 mm/memory.c:6309
do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1337
handle_page_fault arch/x86/mm/fault.c:1480 [inline]
exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1538
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f694c8689c5
RSP: 002b:00007ffcdf993df0 EFLAGS: 00010206
RAX: 00007f6949bc80e0 RBX: 00007ffcdf993ef0 RCX: 0000000000000000
RDX: 00007f6949bc80dc RSI: 0000000000000008 RDI: 00007ffcdf993ef0
RBP: 00000000000003e6 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffcdf993ed0 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000037f20 R14: fffffffffffc80e0 R15: 0000000000037f20
INFO: task syz.1.4018:23302 blocked for more than 143 seconds.
Not tainted 6.15.0-rc4-syzkaller-00011-gf15d97df5afa #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.4018 state:D stack:27112 pid:23302 tgid:23290 ppid:16791 task_flags:0x400040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x116f/0x5de0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
io_schedule+0xbf/0x130 kernel/sched/core.c:7742
folio_wait_bit_common+0x3d6/0x9e0 mm/filemap.c:1317
folio_wait_writeback+0x3c/0x90 mm/page-writeback.c:3149
__filemap_fdatawait_range+0x11f/0x200 mm/filemap.c:539
file_write_and_wait_range+0x101/0x140 mm/filemap.c:798
ext4_sync_file+0x310/0xf10 fs/ext4/fsync.c:154
vfs_fsync_range+0x136/0x220 fs/sync.c:187
__do_sys_msync+0x3cb/0x5c0 mm/msync.c:96
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f748a98e969
RSP: 002b:00007f748b746038 EFLAGS: 00000246 ORIG_RAX: 000000000000001a
RAX: ffffffffffffffda RBX: 00007f748abb6240 RCX: 00007f748a98e969
RDX: 0000000400000004 RSI: 0180000000000000 RDI: 000000001ffff000
RBP: 00007f748aa10ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f748abb6240 R15: 00007ffe8b67a7f8
INFO: task syz.4.4027:23343 blocked for more than 143 seconds.
Not tainted 6.15.0-rc4-syzkaller-00011-gf15d97df5afa #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.4027 state:D stack:28552 pid:23343 tgid:23337 ppid:20944 task_flags:0x400040 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x116f/0x5de0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
io_schedule+0xbf/0x130 kernel/sched/core.c:7742
folio_wait_bit_common+0x3d6/0x9e0 mm/filemap.c:1317
folio_wait_writeback+0x3c/0x90 mm/page-writeback.c:3149
truncate_inode_partial_folio+0x14f/0xe10 mm/truncate.c:207
truncate_inode_pages_range+0x490/0xe30 mm/truncate.c:387
ext4_truncate_page_cache_block_range+0xcf/0x600 fs/ext4/inode.c:3974
ext4_punch_hole+0x2e1/0xf80 fs/ext4/inode.c:4049
ext4_fallocate+0xd42/0x3810 fs/ext4/extents.c:4766
vfs_fallocate+0x608/0x10b0 fs/open.c:338
madvise_remove mm/madvise.c:1034 [inline]
madvise_vma_behavior+0x1a75/0x1d50 mm/madvise.c:1263
madvise_walk_vmas+0x1ce/0x2c0 mm/madvise.c:1530
madvise_do_behavior+0x12b/0x3b0 mm/madvise.c:1695
do_madvise mm/madvise.c:1782 [inline]
do_madvise+0x10b/0x170 mm/madvise.c:1773
__do_sys_madvise mm/madvise.c:1790 [inline]
__se_sys_madvise mm/madvise.c:1788 [inline]
__x64_sys_madvise+0xa9/0x110 mm/madvise.c:1788
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f55c038e969
RSP: 002b:00007f55c1295038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f55c05b6160 RCX: 00007f55c038e969
RDX: 0000000000000009 RSI: 0000000000000001 RDI: 000000110c230000
RBP: 00007f55c0410ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f55c05b6160 R15: 00007ffe65e00be8
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e3bf440 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e3bf440 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e3bf440 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6764
3 locks held by syz-executor/5818:
#0: ffff888020b44948 (vm_lock){++++}-{0:0}, at: do_user_addr_fault+0x452/0x1370 arch/x86/mm/fault.c:1328
#1: ffff88814a32a518 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x171/0x380 mm/memory.c:3287
#2: ffff88814a32e950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x5e4/0x1410 fs/jbd2/transaction.c:444
6 locks held by kworker/u8:29/7968:
#0: ffff8881412ec948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1: ffffc90003ec7d18 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2: ffff88814a32a0e0 (&type->s_umount_key#31){++++}-{4:4}, at: super_trylock_shared+0x1e/0xf0 fs/super.c:562
#3: ffff88814a32cb98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x1b2/0x820 mm/page-writeback.c:2656
#4: ffff88814a32e950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x5e4/0x1410 fs/jbd2/transaction.c:444
#5: ffff88807902efc0 (&ei->i_data_sem){++++}-{4:4}, at: ext4_map_blocks+0x355/0x1390 fs/ext4/inode.c:705
2 locks held by getty/17253:
#0: ffff888035c9a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc90004f0b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222
3 locks held by syz.4.4027/23343:
#0: ffff88814a32a420 (sb_writers#4){.+.+}-{0:0}, at: madvise_remove mm/madvise.c:1034 [inline]
#0: ffff88814a32a420 (sb_writers#4){.+.+}-{0:0}, at: madvise_vma_behavior+0x1a75/0x1d50 mm/madvise.c:1263
#1: ffff88807902f130 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
#1: ffff88807902f130 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: ext4_fallocate+0x111/0x3810 fs/ext4/extents.c:4737
#2: ffff88807902f2d0 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_invalidate_lock include/linux/fs.h:912 [inline]
#2: ffff88807902f2d0 (mapping.invalidate_lock#2){++++}-{4:4}, at: ext4_fallocate+0x1bc/0x3810 fs/ext4/extents.c:4759
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc4-syzkaller-00011-gf15d97df5afa #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
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:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline]
watchdog+0xf70/0x12c0 kernel/hung_task.c:437
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
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: 0 Comm: swapper/1 Not tainted 6.15.0-rc4-syzkaller-00011-gf15d97df5afa #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:81
Code: 86 65 02 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 43 29 21 00 fb f4 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc90000197df8 EFLAGS: 000002c2
RAX: 0000000000460fab RBX: 0000000000000001 RCX: ffffffff8b68c3e9
RDX: 0000000000000000 RSI: ffffffff8dbd9cfb RDI: ffffffff8bf467a0
RBP: ffffed1003b59b40 R08: 0000000000000001 R09: ffffed10170a65bd
R10: ffff8880b8532deb R11: 0000000000000000 R12: 0000000000000001
R13: ffff88801dacda00 R14: ffffffff90850e10 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888124aef000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000559743cd67c8 CR3: 000000000e180000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:748
default_idle_call+0x6d/0xb0 kernel/sched/idle.c:117
cpuidle_idle_call kernel/sched/idle.c:185 [inline]
do_idle+0x391/0x510 kernel/sched/idle.c:325
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:423
start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:315
common_startup_64+0x13e/0x148