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charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 2c9b3512402e Merge tag 'for-linus' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=158ef15e980000 kernel config: https://syzkaller.appspot.com/x/.config?x=f4925140c45a2a50 dashboard link: https://syzkaller.appspot.com/bug?extid=1a8e2b31f2ac9bd3d148 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=136eee95980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1510b445980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/3c29a41eae6b/disk-2c9b3512.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/938da4f6bc30/vmlinux-2c9b3512.xz kernel image: https://storage.googleapis.com/syzbot-assets/4f9521f6c1ef/bzImage-2c9b3512.xz mounted in repro #1: https://storage.googleapis.com/syzbot-assets/1d96e2146be6/mount_0.gz mounted in repro #2: https://storage.googleapis.com/syzbot-assets/f1a30c7339a7/mount_14.gz mounted in repro #3: https://storage.googleapis.com/syzbot-assets/b4ae6212a921/mount_18.gz The issue was bisected to: commit 3bdb7f161697e2d5123b89fe1778ef17a44858e7 Author: Jaegeuk Kim Date: Wed Apr 3 23:07:53 2024 +0000 f2fs: don't set RO when shutting down f2fs bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15dcb445980000 final oops: https://syzkaller.appspot.com/x/report.txt?x=17dcb445980000 console output: https://syzkaller.appspot.com/x/log.txt?x=13dcb445980000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1a8e2b31f2ac9bd3d148@syzkaller.appspotmail.com Fixes: 3bdb7f161697 ("f2fs: don't set RO when shutting down f2fs") F2FS-fs (loop4): Mounted with checkpoint version = 48b305e5 F2FS-fs (loop4): Stopped filesystem due to reason: 0 ================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: null-ptr-deref in atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:252 [inline] BUG: KASAN: null-ptr-deref in __refcount_add include/linux/refcount.h:184 [inline] BUG: KASAN: null-ptr-deref in __refcount_inc include/linux/refcount.h:241 [inline] BUG: KASAN: null-ptr-deref in refcount_inc include/linux/refcount.h:258 [inline] BUG: KASAN: null-ptr-deref in get_task_struct include/linux/sched/task.h:118 [inline] BUG: KASAN: null-ptr-deref in kthread_stop+0xca/0x630 kernel/kthread.c:704 Write of size 4 at addr 0000000000000028 by task syz-executor169/7772 CPU: 1 PID: 7772 Comm: syz-executor169 Not tainted 6.10.0-syzkaller-11185-g2c9b3512402e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_report+0xe8/0x550 mm/kasan/report.c:491 kasan_report+0x143/0x180 mm/kasan/report.c:601 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:252 [inline] __refcount_add include/linux/refcount.h:184 [inline] __refcount_inc include/linux/refcount.h:241 [inline] refcount_inc include/linux/refcount.h:258 [inline] get_task_struct include/linux/sched/task.h:118 [inline] kthread_stop+0xca/0x630 kernel/kthread.c:704 f2fs_stop_gc_thread+0x65/0xb0 fs/f2fs/gc.c:210 f2fs_do_shutdown+0x192/0x540 fs/f2fs/file.c:2283 f2fs_ioc_shutdown fs/f2fs/file.c:2325 [inline] __f2fs_ioctl+0x443a/0xbe60 fs/f2fs/file.c:4325 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xfc/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: 0033:0x7fac5a221249 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 71 1d 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:00007fac5a1ce218 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fac5a2a8708 RCX: 00007fac5a221249 RDX: 0000000020000140 RSI: 000000008004587d RDI: 0000000000000005 RBP: 00007fac5a2a8700 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fac5a274b1c R13: 00007fac5a274040 R14: 00007fac5a26e057 R15: 8c02ea27aa268e19 ================================================================== --- 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@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection 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