Hello, When using our customized fuzzer tool to fuzz the latest Linux kernel, the following crash was triggered. HEAD commit: fc033cf25e612e840e545f8d5ad2edd6ba613ed5 git tree: upstream Console output: https://drive.google.com/file/d/1aWtDTAUFlAzvMI7YM_TLWbfbyqKFB71i/view?usp=drive_link Kernel config: https://drive.google.com/file/d/1n2sLNg-YcIgZqhhQqyMPTDWM_N1Pqz73/view?usp=sharing C reproducer: https://drive.google.com/file/d/1oXFZgdxZDCrcZTmyatmI6TeYoHCaIxEA/view?usp=drive_link Syzlang reproducer: https://drive.google.com/file/d/1KX9cnANDRzXZ1FjKl3uv6rSFC-5kLsko/view?usp=sharing If you fix this issue, please add the following tag to the commit: Reported-by: Kun Hu <huk23@xxxxxxxxxxxxxx>, Jiaji Qin <jjtan24@xxxxxxxxxxxxxx> watchdog: BUG: soft lockup - CPU#1 stuck for 26s! [syz-executor140:420] Modules linked in: irq event stamp: 163590 hardirqs last enabled at (163589): [<ffffffff9c4d07eb>] irqentry_exit+0x3b/0x90 kernel/entry/common.c:357 hardirqs last disabled at (163590): [<ffffffff9c4cedbf>] sysvec_apic_timer_interrupt+0xf/0xb0 arch/x86/kernel/apic/apic.c:1049 softirqs last enabled at (163576): [<ffffffff9450f554>] softirq_handle_end kernel/softirq.c:407 [inline] softirqs last enabled at (163576): [<ffffffff9450f554>] handle_softirqs+0x544/0x870 kernel/softirq.c:589 softirqs last disabled at (163555): [<ffffffff9451120e>] __do_softirq kernel/softirq.c:595 [inline] softirqs last disabled at (163555): [<ffffffff9451120e>] invoke_softirq kernel/softirq.c:435 [inline] softirqs last disabled at (163555): [<ffffffff9451120e>] __irq_exit_rcu kernel/softirq.c:662 [inline] softirqs last disabled at (163555): [<ffffffff9451120e>] irq_exit_rcu+0xee/0x140 kernel/softirq.c:678 CPU: 1 UID: 0 PID: 420 Comm: syz-executor140 Not tainted 6.13.0-rc5 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:exfat_clear_bitmap+0x3f1/0x580 fs/exfat/balloc.c:174 Code: 24 60 01 00 00 b9 40 0c 00 00 4c 89 fa e8 57 10 ff 01 bf a1 ff ff ff 89 c3 89 c6 e8 49 52 5f ff 83 fb a1 74 13 48 83 c4 18 5b <5d> 41 5c 41 5d 41 5e 41 5f e9 01 50 5f ff e8 fc 4f 5f ff 49 8d b4 RSP: 0018:ffa00000035f7a90 EFLAGS: 00000286 RAX: 0000000000000000 RBX: 0000000000006ccc RCX: ffffffff952a4d03 RDX: 0000000000000011 RSI: ff110000118ba340 RDI: 0000000000000003 RBP: ff110000131cc000 R08: 0000000000000000 R09: fffffbfff4d5f0ed R10: fffffbfff4d5f0ec R11: 0000000000000001 R12: ff110000131ce000 R13: 0000000000000011 R14: 0000000000000000 R15: 0000000006cccf6b FS: 000055556ed2d880(0000) GS:ff11000053a80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe1b6fdd18 CR3: 000000000db32002 CR4: 0000000000771ef0 PKRU: 55555554 Call Trace: <IRQ> </IRQ> <TASK> __exfat_free_cluster+0x775/0x980 fs/exfat/fatent.c:192 exfat_free_cluster+0x7a/0x100 fs/exfat/fatent.c:232 __exfat_truncate+0x6bf/0x900 fs/exfat/file.c:235 exfat_evict_inode+0x10d/0x1a0 fs/exfat/inode.c:683 evict+0x403/0x880 fs/inode.c:796 iput_final fs/inode.c:1946 [inline] iput fs/inode.c:1972 [inline] iput+0x51c/0x830 fs/inode.c:1958 do_unlinkat+0x5c7/0x750 fs/namei.c:4594 __do_sys_unlink fs/namei.c:4635 [inline] __se_sys_unlink fs/namei.c:4633 [inline] __x64_sys_unlink+0x40/0x50 fs/namei.c:4633 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xc3/0x1d0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff5d82fb1db Code: 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe1b6ff558 EFLAGS: 00000206 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff5d82fb1db RDX: 00007ffe1b6ff580 RSI: 00007ffe1b6ff580 RDI: 00007ffe1b6ff610 RBP: 00007ffe1b6ff610 R08: 0000000000000001 R09: 00007ffe1b6ff3e0 R10: 00000000fffffff7 R11: 0000000000000206 R12: 00007ffe1b700710 R13: 000055556ed36bb0 R14: 00007ffe1b6ff578 R15: 0000000000000001 </TASK> --------------- thanks, Kun Hu
