Hello, syzbot found the following issue on: HEAD commit: 9500fc6e9e60 Merge branch 'for-next/core' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=1540810d880000 kernel config: https://syzkaller.appspot.com/x/.config?x=b25c9f218686dd5e dashboard link: https://syzkaller.appspot.com/bug?extid=3c4ce3260a74215d1deb compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: arm64 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/1363e60652f7/disk-9500fc6e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/fcc4da811bb6/vmlinux-9500fc6e.xz kernel image: https://storage.googleapis.com/syzbot-assets/0b554298f1fa/Image-9500fc6e.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3c4ce3260a74215d1deb@xxxxxxxxxxxxxxxxxxxxxxxxx EXT2-fs (loop5): error: revision level too high, forcing read-only mode ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(lock->magic != lock) WARNING: CPU: 0 PID: 23017 at kernel/locking/mutex.c:582 __mutex_lock_common+0x4c4/0xca8 kernel/locking/mutex.c:582 Modules linked in: CPU: 0 PID: 23017 Comm: syz-executor.5 Not tainted 6.1.0-rc5-syzkaller-32269-g9500fc6e9e60 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __mutex_lock_common+0x4c4/0xca8 kernel/locking/mutex.c:582 lr : __mutex_lock_common+0x4c4/0xca8 kernel/locking/mutex.c:582 sp : ffff800013ee3ca0 x29: ffff800013ee3d10 x28: ffff80000eefa000 x27: 0000000000000000 x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000002 x23: ffff80000879d3d4 x22: 0000000000000000 x21: 0000000000000000 x20: 0000000000000000 x19: ffff0000f751c428 x18: 0000000000000157 x17: ffff80000c0ed83c x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000012 x12: 0000000000040000 x11: 0000000000000c6a x10: ffff80001ad76000 x9 : 72cc9bc43b455200 x8 : 72cc9bc43b455200 x7 : 4e5241575f534b43 x6 : ffff80000c0b2b74 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000100000000 x0 : 0000000000000028 Call trace: __mutex_lock_common+0x4c4/0xca8 kernel/locking/mutex.c:582 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 reiserfs_write_lock+0x3c/0x64 fs/reiserfs/lock.c:27 reiserfs_dir_fsync+0x70/0xb8 fs/reiserfs/dir.c:42 vfs_fsync_range fs/sync.c:188 [inline] vfs_fsync fs/sync.c:202 [inline] do_fsync fs/sync.c:212 [inline] __do_sys_fdatasync fs/sync.c:225 [inline] __se_sys_fdatasync fs/sync.c:223 [inline] __arm64_sys_fdatasync+0x60/0xb8 fs/sync.c:223 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584 irq event stamp: 831 hardirqs last enabled at (831): [<ffff8000080388c4>] local_daif_restore arch/arm64/include/asm/daifflags.h:75 [inline] hardirqs last enabled at (831): [<ffff8000080388c4>] el0_svc_common+0x40/0x220 arch/arm64/kernel/syscall.c:107 hardirqs last disabled at (830): [<ffff80000c0a53a4>] el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 softirqs last enabled at (826): [<ffff80000801c38c>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (824): [<ffff80000801c358>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- Unable to handle kernel NULL pointer dereference at virtual address 0000000000000054 Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000006 CM = 0, WnR = 0 user pgtable: 4k pages, 48-bit VAs, pgdp=000000010acce000 [0000000000000054] pgd=08000001413b5003, p4d=08000001413b5003, pud=08000001371ff003, pmd=0000000000000000 Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 23017 Comm: syz-executor.5 Tainted: G W 6.1.0-rc5-syzkaller-32269-g9500fc6e9e60 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022 pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : owner_on_cpu include/linux/sched.h:2290 [inline] pc : mutex_can_spin_on_owner kernel/locking/mutex.c:409 [inline] pc : mutex_optimistic_spin+0x1c8/0x254 kernel/locking/mutex.c:452 lr : __mutex_lock_common+0x1b4/0xca8 kernel/locking/mutex.c:607 sp : ffff800013ee3c40 x29: ffff800013ee3c50 x28: ffff80000eefa000 x27: ffff80000cbd7d0f x26: 0000000000000000 x25: 0000000000000000 x24: ffff0000f751c490 x23: ffff80000879d3d4 x22: ffff80000d3ac000 x21: 0000000000000000 x20: 0000000000000000 x19: ffff0000f751c428 x18: 0000000000000157 x17: ffff80000c0ed83c x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000012 x12: 0000000000040000 x11: 0000000000000c6a x10: ffff80000d3ac000 x9 : 0000000000000003 x8 : 0000000000000020 x7 : 4e5241575f534b43 x6 : ffff80000879d3d4 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff0000f751c428 Call trace: mutex_can_spin_on_owner kernel/locking/mutex.c:408 [inline] mutex_optimistic_spin+0x1c8/0x254 kernel/locking/mutex.c:452 __mutex_lock_common+0x1b4/0xca8 kernel/locking/mutex.c:607 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 reiserfs_write_lock+0x3c/0x64 fs/reiserfs/lock.c:27 reiserfs_dir_fsync+0x70/0xb8 fs/reiserfs/dir.c:42 vfs_fsync_range fs/sync.c:188 [inline] vfs_fsync fs/sync.c:202 [inline] do_fsync fs/sync.c:212 [inline] __do_sys_fdatasync fs/sync.c:225 [inline] __se_sys_fdatasync fs/sync.c:223 [inline] __arm64_sys_fdatasync+0x60/0xb8 fs/sync.c:223 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584 Code: 37080148 f9400268 f27df108 54000080 (b9403509) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 37080148 tbnz w8, #1, 0x28 4: f9400268 ldr x8, [x19] 8: f27df108 ands x8, x8, #0xfffffffffffffff8 c: 54000080 b.eq 0x1c // b.none * 10: b9403509 ldr w9, [x8, #52] <-- trapping instruction --- This report is generated by a bot. 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