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=1756ff03080000 kernel config: https://syzkaller.appspot.com/x/.config?x=5cea15779c42821c dashboard link: https://syzkaller.appspot.com/bug?extid=798ffe5fe3e88235db59 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+798ffe5fe3e88235db59@xxxxxxxxxxxxxxxxxxxxxxxxx loop3: detected capacity change from 0 to 64 BFS-fs: bfs_fill_super(): loop3 is unclean, continuing ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(lock->magic != lock) WARNING: CPU: 1 PID: 6988 at kernel/locking/mutex.c:582 __mutex_lock_common+0x49c/0xc28 kernel/locking/mutex.c:582 Modules linked in: CPU: 1 PID: 6988 Comm: syz-executor.3 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 : ffff8000139aba10 x29: ffff8000139aba80 x28: ffff80000ee9a000 x27: 0000000000000000 x26: 0000000000000000 x25: ffff80000876a864 x24: 0000000000000002 x23: ffff800008794be8 x22: 0000000000000000 x21: 0000000000000000 x20: 0000000000000000 x19: ffff0000f81c8228 x18: 000000000000031c x17: ffff80000c04d6bc x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000012 x12: 0000000000040000 x11: 0000000000001055 x10: ffff80001d0cc000 x9 : c740583a05b0ad00 x8 : c740583a05b0ad00 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_readdir_inode+0x9c/0x68c fs/reiserfs/dir.c:79 reiserfs_readdir+0x28/0x38 fs/reiserfs/dir.c:274 iterate_dir+0x114/0x28c __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64 fs/readdir.c:354 [inline] __arm64_sys_getdents64+0x80/0x214 fs/readdir.c:354 __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: 1339 hardirqs last enabled at (1339): [<ffff800008038c9c>] local_daif_restore arch/arm64/include/asm/daifflags.h:75 [inline] hardirqs last enabled at (1339): [<ffff800008038c9c>] el0_svc_common+0x40/0x220 arch/arm64/kernel/syscall.c:107 hardirqs last disabled at (1338): [<ffff80000bffee18>] el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:642 softirqs last enabled at (1334): [<ffff80000801c1f4>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (1332): [<ffff80000801c1c0>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ WARNING: CPU: 1 PID: 6988 at fs/reiserfs/lock.c:91 reiserfs_check_lock_depth+0x48/0x50 fs/reiserfs/lock.c:91 Modules linked in: CPU: 1 PID: 6988 Comm: syz-executor.3 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: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : reiserfs_check_lock_depth+0x48/0x50 fs/reiserfs/lock.c:91 lr : reiserfs_check_lock_depth+0x48/0x50 fs/reiserfs/lock.c:91 sp : ffff8000139abaf0 x29: ffff8000139abaf0 x28: ffff0000f6cc9a80 x27: 0000000000000000 x26: ffff0000ca4987b8 x25: ffff80000876a864 x24: 0000000000000000 x23: 0000000000000000 x22: 000000000000003d x21: ffff8000139abd80 x20: ffff0000ca4987b8 x19: 00000000f81c82c1 x18: 000000000000031c x17: ffff80000c04d6bc x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000012 x12: 0000000000040000 x11: 00000000000115cc x10: ffff80001d0cc000 x9 : ffff800008794da0 x8 : 00000000000115cd x7 : 4e5241575f534b43 x6 : ffff800008794be8 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : ffff0000f6cc9a87 x1 : 00000000f81c82c1 x0 : 0000000000000000 Call trace: reiserfs_check_lock_depth+0x48/0x50 fs/reiserfs/lock.c:91 reiserfs_readdir_inode+0xac/0x68c fs/reiserfs/dir.c:81 reiserfs_readdir+0x28/0x38 fs/reiserfs/dir.c:274 iterate_dir+0x114/0x28c __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64 fs/readdir.c:354 [inline] __arm64_sys_getdents64+0x80/0x214 fs/readdir.c:354 __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: 1339 hardirqs last enabled at (1339): [<ffff800008038c9c>] local_daif_restore arch/arm64/include/asm/daifflags.h:75 [inline] hardirqs last enabled at (1339): [<ffff800008038c9c>] el0_svc_common+0x40/0x220 arch/arm64/kernel/syscall.c:107 hardirqs last disabled at (1338): [<ffff80000bffee18>] el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:642 softirqs last enabled at (1334): [<ffff80000801c1f4>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (1332): [<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 000000000000003d 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=0000000109179000 [000000000000003d] pgd=080000013ca85003, p4d=080000013ca85003, pud=0800000135d37003, pmd=0000000000000000 Internal error: Oops: 96000006 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 6988 Comm: syz-executor.3 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: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : search_by_key+0x110/0x19d8 fs/reiserfs/stree.c:648 lr : pathrelse fs/reiserfs/stree.c:384 [inline] lr : search_by_key+0xf0/0x19d8 fs/reiserfs/stree.c:641 sp : ffff8000139ab920 x29: ffff8000139aba60 x28: ffff8000139abc10 x27: 0000000000000000 x26: ffff0000ca4987b8 x25: ffff80000876a864 x24: 0000000000000000 x23: 0000000000000000 x22: ffff0000f6492000 x21: 0000000000000001 x20: ffff0000f6492000 x19: ffff8000139abb50 x18: 000000000000031c x17: ffff80000c04d6bc x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000012 x12: 0000000000040000 x11: 0000000000023422 x10: ffff80001d0cc000 x9 : 0000000000000002 x8 : 0000000000000035 x7 : 4e5241575f534b43 x6 : ffff800008794be8 x5 : 0000000000000000 x4 : 0000000000000003 x3 : 0000000000000008 x2 : ffff8000139abc10 x1 : 0000000000000001 x0 : 0000000000000001 Call trace: search_by_key+0x110/0x19d8 fs/reiserfs/stree.c:648 search_by_entry_key+0x44/0x370 fs/reiserfs/namei.c:125 reiserfs_readdir_inode+0x100/0x68c fs/reiserfs/dir.c:98 reiserfs_readdir+0x28/0x38 fs/reiserfs/dir.c:274 iterate_dir+0x114/0x28c __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64 fs/readdir.c:354 [inline] __arm64_sys_getdents64+0x80/0x214 fs/readdir.c:354 __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: f9433e88 52800049 52800103 f9400508 (b9400901) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: f9433e88 ldr x8, [x20, #1656] 4: 52800049 mov w9, #0x2 // #2 8: 52800103 mov w3, #0x8 // #8 c: f9400508 ldr x8, [x8, #8] * 10: b9400901 ldr w1, [x8, #8] <-- trapping instruction --- This report is generated by a bot. 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