Hello, syzbot found the following issue on: HEAD commit: a41a877bc12d Merge branch 'for-next/fixes' 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=1180b113080000 kernel config: https://syzkaller.appspot.com/x/.config?x=5cea15779c42821c dashboard link: https://syzkaller.appspot.com/bug?extid=392ac209604cc18792e5 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. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+392ac209604cc18792e5@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(lock->magic != lock) WARNING: CPU: 1 PID: 13919 at kernel/locking/mutex.c:582 __mutex_lock_common+0x49c/0xc28 kernel/locking/mutex.c:582 Modules linked in: CPU: 1 PID: 13919 Comm: syz-executor.1 Not tainted 6.0.0-rc2-syzkaller-16455-ga41a877bc12d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/20/2022 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __mutex_lock_common+0x49c/0xc28 kernel/locking/mutex.c:582 lr : __mutex_lock_common+0x49c/0xc28 kernel/locking/mutex.c:582 sp : ffff80001404b8e0 x29: ffff80001404b950 x28: ffff80000ee9a000 x27: ffff0000e7ff7c30 x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000002 x23: ffff800008794be8 x22: 0000000000000000 x21: 0000000000000000 x20: 0000000000000000 x19: ffff000100ce2228 x18: 0000000000000144 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000012 x12: 0000000000040000 x11: 0000000000008995 x10: ffff800017d28000 x9 : 8ae7bd2ab6f62200 x8 : 8ae7bd2ab6f62200 x7 : 4e5241575f534b43 x6 : ffff800008197c8c x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000100000000 x0 : 0000000000000028 Call trace: __mutex_lock_common+0x49c/0xc28 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_lookup+0xa4/0x1c4 fs/reiserfs/namei.c:364 lookup_open fs/namei.c:3391 [inline] open_last_lookups fs/namei.c:3481 [inline] path_openat+0x738/0x11c4 fs/namei.c:3688 do_filp_open+0xdc/0x1b8 fs/namei.c:3718 do_sys_openat2+0xb8/0x22c fs/open.c:1311 do_sys_open fs/open.c:1327 [inline] __do_sys_openat fs/open.c:1343 [inline] __se_sys_openat fs/open.c:1338 [inline] __arm64_sys_openat+0xb0/0xe0 fs/open.c:1338 __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+0x48/0x154 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:624 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:642 el0t_64_sync+0x18c/0x190 irq event stamp: 1381 hardirqs last enabled at (1381): [<ffff8000085e9378>] seqcount_lockdep_reader_access include/linux/seqlock.h:104 [inline] hardirqs last enabled at (1381): [<ffff8000085e9378>] read_seqbegin include/linux/seqlock.h:836 [inline] hardirqs last enabled at (1381): [<ffff8000085e9378>] d_alloc_parallel+0x254/0xad0 fs/dcache.c:2657 hardirqs last disabled at (1380): [<ffff8000085e9300>] seqcount_lockdep_reader_access include/linux/seqlock.h:101 [inline] hardirqs last disabled at (1380): [<ffff8000085e9300>] read_seqbegin include/linux/seqlock.h:836 [inline] hardirqs last disabled at (1380): [<ffff8000085e9300>] d_alloc_parallel+0x1dc/0xad0 fs/dcache.c:2657 softirqs last enabled at (1248): [<ffff80000801c1f4>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (1246): [<ffff80000801c1c0>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 Mem abort info: ESR = 0x0000000086000006 EC = 0x21: IABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault user pgtable: 4k pages, 48-bit VAs, pgdp=0000000140c5a000 [0000000000000000] pgd=080000012f58f003, p4d=080000012f58f003, pud=080000012f58c003, pmd=0000000000000000 Internal error: Oops: 86000006 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 13919 Comm: syz-executor.1 Tainted: G W 6.0.0-rc2-syzkaller-16455-ga41a877bc12d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/20/2022 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : 0x0 lr : get_third_component fs/reiserfs/namei.c:196 [inline] lr : reiserfs_find_entry+0x130/0x298 fs/reiserfs/namei.c:317 sp : ffff80001404b960 x29: ffff80001404b990 x28: 0000000000000000 x27: ffff0000e7ff7c30 x26: ffff0000e7ffc000 x25: ffff0000eea4f000 x24: 0000000010000000 x23: ffff0000e7ffc070 x22: 0000000000000005 x21: ffff80001404b9e0 x20: ffff80001404ba48 x19: ffff0000eb8c0190 x18: 0000000000000144 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000002 x13: 0000000000000002 x12: 0000000000040000 x11: 000000000003ffff x10: ffff800017d28000 x9 : ffff80000875c888 x8 : 0000000000000000 x7 : 4e5241575f534b43 x6 : ffff800008794be8 x5 : 0000000000000000 x4 : ffff80001404b9e0 x3 : ffff80001404ba48 x2 : 0000000000000005 x1 : 0000000000000005 x0 : ffff0000e7ffc070 Call trace: 0x0 reiserfs_lookup+0xc4/0x1c4 fs/reiserfs/namei.c:368 lookup_open fs/namei.c:3391 [inline] open_last_lookups fs/namei.c:3481 [inline] path_openat+0x738/0x11c4 fs/namei.c:3688 do_filp_open+0xdc/0x1b8 fs/namei.c:3718 do_sys_openat2+0xb8/0x22c fs/open.c:1311 do_sys_open fs/open.c:1327 [inline] __do_sys_openat fs/open.c:1343 [inline] __se_sys_openat fs/open.c:1338 [inline] __arm64_sys_openat+0xb0/0xe0 fs/open.c:1338 __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+0x48/0x154 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:624 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:642 el0t_64_sync+0x18c/0x190 Code: bad PC value ---[ end trace 0000000000000000 ]--- --- 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.
