Hello, syzbot found the following issue on: HEAD commit: a430d95c5efa Merge tag 'lsm-pr-20240911' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15569d00580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d9ab5893ec5191eb dashboard link: https://syzkaller.appspot.com/bug?extid=bf0143df12877cb1a21b compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=109e6a77980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/f8549392ace4/disk-a430d95c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9b866ef0c06c/vmlinux-a430d95c.xz kernel image: https://storage.googleapis.com/syzbot-assets/9d6691641029/bzImage-a430d95c.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/dd50a033ca89/mount_2.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+bf0143df12877cb1a21b@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task syz.0.75:6468 blocked for more than 143 seconds. Not tainted 6.11.0-syzkaller-02574-ga430d95c5efa #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.75 state:D stack:24864 pid:6468 tgid:6446 ppid:6378 flags:0x00004004 Call Trace: <TASK> context_switch kernel/sched/core.c:5188 [inline] __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6621 xfs_ail_push_all_sync+0x236/0x310 fs/xfs/xfs_trans_ail.c:726 xfs_log_quiesce+0xdf/0x5b0 fs/xfs/xfs_log.c:1018 xfs_fs_freeze+0x8d/0x1a0 fs/xfs/xfs_super.c:936 freeze_super+0x81b/0xee0 fs/super.c:2107 fs_bdev_freeze+0x1ac/0x320 fs/super.c:1484 bdev_freeze+0xd6/0x220 block/bdev.c:257 xfs_fs_goingdown+0xa9/0x160 fs/xfs/xfs_fsops.c:446 xfs_file_ioctl+0x12d4/0x19e0 fs/xfs/xfs_ioctl.c:1473 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc862d7def9 RSP: 002b:00007fc863b4a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fc862f36058 RCX: 00007fc862d7def9 RDX: 0000000020000080 RSI: 000000008004587d RDI: 0000000000000006 RBP: 00007fc862df0b76 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fc862f36058 R15: 00007ffd1aceae18 </TASK> Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8e738660 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline] #0: ffffffff8e738660 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #0: ffffffff8e738660 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6626 2 locks held by getty/4972: #0: ffff888034b890a0 (&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+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 5 locks held by syz.0.75/6468: #0: ffff888022c9c6b0 (&bdev->bd_fsfreeze_mutex){+.+.}-{3:3}, at: bdev_freeze+0x2a/0x220 block/bdev.c:248 #1: ffff888031aac420 (sb_writers#12){++++}-{0:0}, at: sb_wait_write fs/super.c:1896 [inline] #1: ffff888031aac420 (sb_writers#12){++++}-{0:0}, at: freeze_super+0x4e9/0xee0 fs/super.c:2085 #2: ffff888031aac0e0 (&type->s_umount_key#53){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline] #2: ffff888031aac0e0 (&type->s_umount_key#53){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #2: ffff888031aac0e0 (&type->s_umount_key#53){+.+.}-{3:3}, at: freeze_super+0x4f1/0xee0 fs/super.c:2086 #3: ffff888031aac518 (sb_pagefaults#2){+.+.}-{0:0}, at: sb_wait_write fs/super.c:1896 [inline] #3: ffff888031aac518 (sb_pagefaults#2){+.+.}-{0:0}, at: freeze_super+0x519/0xee0 fs/super.c:2090 #4: ffff888031aac610 (sb_internal#2){++++}-{0:0}, at: sb_wait_write fs/super.c:1896 [inline] #4: ffff888031aac610 (sb_internal#2){++++}-{0:0}, at: freeze_super+0x7cc/0xee0 fs/super.c:2104 1 lock held by syz-executor/6470: #0: ffffffff8e73da38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:296 [inline] #0: ffffffff8e73da38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:958 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-syzkaller-02574-ga430d95c5efa #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 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:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xff4/0x1040 kernel/hung_task.c:379 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 4661 Comm: klogd Not tainted 6.11.0-syzkaller-02574-ga430d95c5efa #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:filter_irq_stacks+0x4f/0xa0 kernel/stacktrace.c:397 Code: f0 84 bd 8b 48 89 fb eb 0c 49 ff c7 48 83 c3 08 4d 39 fc 74 4f 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 48 89 df e8 e7 6a 78 00 4b 8b 04 fe 48 39 e8 72 0c 48 c7 c1 RSP: 0018:ffffc90003137418 EFLAGS: 00000246 RAX: 1ffff92000626e96 RBX: ffffc900031374b0 RCX: dffffc0000000000 RDX: 0000000000400cc0 RSI: 000000000000000c RDI: ffffc900031374b0 RBP: ffffffff8bc00230 R08: ffffffff81378892 R09: 1ffffffff1ff501d R10: dffffc0000000000 R11: fffffbfff1ff501e R12: 000000000000000c R13: ffffffff8bbd84f0 R14: ffffc900031374b0 R15: 0000000000000000 FS: 00007f80f557f380(0000) GS:ffff8880b8900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f37b7714000 CR3: 0000000063a2e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <TASK> stack_depot_save_flags+0x29/0x830 lib/stackdepot.c:609 kasan_save_stack mm/kasan/common.c:48 [inline] kasan_save_track+0x51/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3989 [inline] slab_alloc_node mm/slub.c:4038 [inline] kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4081 __alloc_skb+0x1c3/0x440 net/core/skbuff.c:668 alloc_skb include/linux/skbuff.h:1322 [inline] alloc_skb_with_frags+0xc3/0x820 net/core/skbuff.c:6612 sock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2883 unix_dgram_sendmsg+0x6d3/0x1f80 net/unix/af_unix.c:2027 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 __sys_sendto+0x398/0x4f0 net/socket.c:2210 __do_sys_sendto net/socket.c:2222 [inline] __se_sys_sendto net/socket.c:2218 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2218 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f80f56e19b5 Code: 8b 44 24 08 48 83 c4 28 48 98 c3 48 98 c3 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 26 45 31 c9 45 31 c0 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 7a 48 8b 15 44 c4 0c 00 f7 d8 64 89 02 48 83 RSP: 002b:00007ffe65f0c128 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f80f56e19b5 RDX: 000000000000004f RSI: 000055b41fbcd6b0 RDI: 0000000000000003 RBP: 000055b41fbc8910 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000004000 R11: 0000000000000246 R12: 0000000000000013 R13: 00007f80f586f212 R14: 00007ffe65f0c228 R15: 0000000000000000 </TASK> --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
