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Message-ID: <68259418.050a0220.14a71a.0105.GAE@google.com> Date: Thu, 15 May 2025 00:13:28 -0700 From: syzbot <syzbot+a08f8023365819890eae@...kaller.appspotmail.com> To: kent.overstreet@...ux.dev, linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: [syzbot] [bcachefs?] WARNING in srcu_gp_start_if_needed Hello, syzbot found the following issue on: HEAD commit: c32f8dc5aaf9 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=138c1cf4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=ea4635ffd6ad5b4a dashboard link: https://syzkaller.appspot.com/bug?extid=a08f8023365819890eae compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1537d768580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/b921498959d4/disk-c32f8dc5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/04e6ad946c4b/vmlinux-c32f8dc5.xz kernel image: https://storage.googleapis.com/syzbot-assets/d4f0d8db50ee/Image-c32f8dc5.gz.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/761fa2621022/mount_18.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a08f8023365819890eae@...kaller.appspotmail.com bcachefs (loop2): going read-write bcachefs (loop2): marking bcachefs (loop2): marking superblocks ------------[ cut here ]------------ WARNING: CPU: 0 PID: 7109 at kernel/rcu/srcutree.c:1325 __srcu_read_unlock kernel/rcu/srcutree.c:-1 [inline] WARNING: CPU: 0 PID: 7109 at kernel/rcu/srcutree.c:1325 __srcu_read_unlock_nmisafe include/linux/srcu.h:119 [inline] WARNING: CPU: 0 PID: 7109 at kernel/rcu/srcutree.c:1325 srcu_gp_start_if_needed+0xeac/0x10d0 kernel/rcu/srcutree.c:1347 Modules linked in: CPU: 0 UID: 0 PID: 7109 Comm: syz.2.84 Not tainted 6.15.0-rc5-syzkaller-gc32f8dc5aaf9 #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 pstate: 804000c5 (Nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : srcu_gp_start_if_needed+0xeac/0x10d0 kernel/rcu/srcutree.c:-1 lr : srcu_gp_start_if_needed+0x574/0x10d0 kernel/rcu/srcutree.c:1325 sp : ffff80009b646250 x29: ffff80009b6462e0 x28: fffffdffbf7750c0 x27: 00000000000000c0 x26: dfff800000000000 x25: fffffffffffffe77 x24: ffff0000ed1d5b88 x23: ffff0000c8961980 x22: 0000000000000000 x21: fffffffffffffe74 x20: ffff0000f9784250 x19: fffffdffbf775080 x18: 0000000000000000 x17: 0000000000000000 x16: ffff80008adb421c x15: ffff7000136c8c34 x14: 1ffff000136c8c34 x13: 0000000000000004 x12: ffffffffffffffff x11: 0000000087094fda x10: 0000000000000003 x9 : 0000000000000000 x8 : 0000000000000000 x7 : ffff80008059d5f8 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : ffff80008ae837c0 x2 : 0000000000000008 x1 : fffffffffffffe74 x0 : 0000000000000000 Call trace: __srcu_read_unlock kernel/rcu/srcutree.c:-1 [inline] (P) __srcu_read_unlock_nmisafe include/linux/srcu.h:119 [inline] (P) srcu_gp_start_if_needed+0xeac/0x10d0 kernel/rcu/srcutree.c:1347 (P) __call_srcu kernel/rcu/srcutree.c:1389 [inline] call_srcu+0xc8/0xe0 kernel/rcu/srcutree.c:1416 __call_rcu+0x38/0x60 fs/bcachefs/rcu_pending.c:76 __rcu_pending_enqueue fs/bcachefs/rcu_pending.c:497 [inline] rcu_pending_enqueue+0x70c/0x840 fs/bcachefs/rcu_pending.c:531 bkey_cached_free+0xb8/0x1c4 fs/bcachefs/btree_key_cache.c:115 bch2_btree_key_cache_drop+0x10c/0x5c8 fs/bcachefs/btree_key_cache.c:619 bch2_trans_commit_write_locked fs/bcachefs/btree_trans_commit.c:772 [inline] do_bch2_trans_commit fs/bcachefs/btree_trans_commit.c:844 [inline] __bch2_trans_commit+0x4ac8/0x62d0 fs/bcachefs/btree_trans_commit.c:1050 bch2_trans_commit fs/bcachefs/btree_update.h:195 [inline] bch2_trans_mark_metadata_bucket+0x328/0xe14 fs/bcachefs/buckets.c:1052 bch2_trans_mark_metadata_sectors fs/bcachefs/buckets.c:1069 [inline] __bch2_trans_mark_dev_sb fs/bcachefs/buckets.c:1109 [inline] bch2_trans_mark_dev_sb+0x318/0x67c fs/bcachefs/buckets.c:1137 bch2_trans_mark_dev_sbs_flags+0x6f4/0x754 fs/bcachefs/buckets.c:1147 bch2_trans_mark_dev_sbs+0x24/0x34 fs/bcachefs/buckets.c:1159 bch2_fs_initialize+0x8cc/0x10ac fs/bcachefs/recovery.c:1153 bch2_fs_start+0x5a0/0x908 fs/bcachefs/super.c:1092 bch2_fs_get_tree+0xa0c/0xf30 fs/bcachefs/fs.c:2570 vfs_get_tree+0x90/0x28c fs/super.c:1759 do_new_mount+0x228/0x814 fs/namespace.c:3884 path_mount+0x5b4/0xde0 fs/namespace.c:4211 do_mount fs/namespace.c:4224 [inline] __do_sys_mount fs/namespace.c:4435 [inline] __se_sys_mount fs/namespace.c:4412 [inline] __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4412 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 irq event stamp: 71278 hardirqs last enabled at (71277): [<ffff800080c25df0>] kasan_quarantine_put+0x1a0/0x1c8 mm/kasan/quarantine.c:234 hardirqs last disabled at (71278): [<ffff8000829dbf38>] __rcu_pending_enqueue fs/bcachefs/rcu_pending.c:432 [inline] hardirqs last disabled at (71278): [<ffff8000829dbf38>] rcu_pending_enqueue+0xc8/0x840 fs/bcachefs/rcu_pending.c:531 softirqs last enabled at (71066): [<ffff8000803cbf1c>] softirq_handle_end kernel/softirq.c:425 [inline] softirqs last enabled at (71066): [<ffff8000803cbf1c>] handle_softirqs+0xaf8/0xc88 kernel/softirq.c:607 softirqs last disabled at (70993): [<ffff800080020efc>] __do_softirq+0x14/0x20 kernel/softirq.c:613 ---[ end trace 0000000000000000 ]--- bcachefs (loop2): initializing freespace bcachefs (loop2): done initializing freespace bcachefs (loop2): reading snapshots table bcachefs (loop2): reading snapshots done bcachefs (loop2): done starting filesystem --- 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@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. 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
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