syzbot has found a reproducer for the following issue on: HEAD commit: f92f4749861b Merge tag 'clk-fixes-for-linus' of git://git... git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=165e73e8580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c7c9f223bfe8924e dashboard link: https://syzkaller.appspot.com/bug?extid=205c2644abdff9d3f9fc 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=1619bb30580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=115e73e8580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/5b8875fea73b/disk-f92f4749.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/bf1ea2d28b68/vmlinux-f92f4749.xz kernel image: https://storage.googleapis.com/syzbot-assets/21f786c9f90d/bzImage-f92f4749.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/d6e372cd93dd/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+205c2644abdff9d3f9fc@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task syz-executor405:5841 blocked for more than 143 seconds. Not tainted 6.13.0-rc2-syzkaller-00031-gf92f4749861b #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor405 state:D stack:27504 pid:5841 tgid:5838 ppid:5837 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:5369 [inline] __schedule+0x17fb/0x4be0 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6848 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905 __mutex_lock_common kernel/locking/mutex.c:665 [inline] __mutex_lock+0x7e7/0xee0 kernel/locking/mutex.c:735 exfat_sync_fs+0xb0/0x160 fs/exfat/super.c:56 iterate_supers+0xc6/0x190 fs/super.c:934 ksys_sync+0xdb/0x1c0 fs/sync.c:104 __do_sys_sync+0xe/0x20 fs/sync.c:113 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: 0033:0x7ff13f9f4849 RSP: 002b:00007ff13f98a218 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007ff13fa7c6d8 RCX: 00007ff13f9f4849 RDX: 00007ff13f9cdfb6 RSI: 0000000000000000 RDI: 00007ff13f98afb0 RBP: 00007ff13fa7c6d0 R08: 00007ffce2fc7077 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff13fa48086 R13: 00007ff13fa4807e R14: 633d73726f727265 R15: 0030656c69662f2e </TASK> Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6744 2 locks held by getty/5572: #0: ffff88814d4a10a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900032fb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 3 locks held by syz-executor405/5840: 2 locks held by syz-executor405/5841: #0: ffff88807d95a0e0 (&type->s_umount_key#64){.+.+}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d95a0e0 (&type->s_umount_key#64){.+.+}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff88807d9580e8 (&sbi->s_lock){+.+.}-{4:4}, at: exfat_sync_fs+0xb0/0x160 fs/exfat/super.c:56 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-rc2-syzkaller-00031-gf92f4749861b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 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:234 [inline] watchdog+0xff6/0x1040 kernel/hung_task.c:397 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: 5840 Comm: syz-executor405 Not tainted 6.13.0-rc2-syzkaller-00031-gf92f4749861b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline] RIP: 0010:rcu_is_watching+0x10/0xb0 kernel/rcu/tree.c:737 Code: 84 00 00 00 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 53 65 ff 05 48 db 7e 7e <e8> db 5d 3b 0a 89 c3 83 f8 08 73 7a 49 bf 00 00 00 00 00 fc ff df RSP: 0018:ffffc9000401f488 EFLAGS: 00000083 RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff81a7289c RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff90183af0 RBP: ffffc9000401f5f8 R08: ffffffff90183af7 R09: 1ffffffff203075e R10: dffffc0000000000 R11: fffffbfff203075f R12: 0000000000000246 R13: dffffc0000000000 R14: 0000000000000200 R15: 00000000000000a0 FS: 00007ff13f9ab6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555571eef738 CR3: 0000000073fd8000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <TASK> trace_irq_disable+0x3b/0x120 include/trace/events/preemptirq.h:36 lookup_bh_lru fs/buffer.c:1359 [inline] __find_get_block+0x190/0x1150 fs/buffer.c:1394 bdev_getblk+0x33/0x670 fs/buffer.c:1425 __bread_gfp+0x86/0x400 fs/buffer.c:1485 sb_bread include/linux/buffer_head.h:346 [inline] exfat_get_dentry+0x53b/0x730 fs/exfat/dir.c:672 exfat_readdir fs/exfat/dir.c:118 [inline] exfat_iterate+0x9f9/0x2ce0 fs/exfat/dir.c:242 wrap_directory_iterator+0x91/0xd0 fs/readdir.c:65 iterate_dir+0x571/0x800 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:403 [inline] __se_sys_getdents64+0x1e2/0x4b0 fs/readdir.c:389 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: 0033:0x7ff13f9f4849 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff13f9ab218 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007ff13fa7c6c8 RCX: 00007ff13f9f4849 RDX: 0000000000001000 RSI: 0000000020000f80 RDI: 0000000000000004 RBP: 00007ff13fa7c6c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff13fa48086 R13: 00007ff13fa4807e R14: 633d73726f727265 R15: 0030656c69662f2e </TASK> INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.207 msecs --- 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.
