./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor3758597651 <...> Warning: Permanently added '10.128.0.122' (ED25519) to the list of known hosts. execve("./syz-executor3758597651", ["./syz-executor3758597651"], 0x7ffd19a060e0 /* 10 vars */) = 0 brk(NULL) = 0x55559156f000 brk(0x55559156fd00) = 0x55559156fd00 arch_prctl(ARCH_SET_FS, 0x55559156f380) = 0 set_tid_address(0x55559156f650) = 5828 set_robust_list(0x55559156f660, 24) = 0 rseq(0x55559156fca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor3758597651", 4096) = 28 getrandom("\x45\x29\x8d\x1e\x92\x25\x02\xa6", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55559156fd00 brk(0x555591590d00) = 0x555591590d00 brk(0x555591591000) = 0x555591591000 mprotect(0x7feb0a0a1000, 16384, PROT_READ) = 0 mmap(0x1ffffffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffffffff000 mmap(0x200000000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200000000000 mmap(0x200001000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200001000000 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = -1 ENXIO (No such device or address) close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5829 attached [pid 5829] set_robust_list(0x55559156f660, 24 [pid 5828] <... clone resumed>, child_tidptr=0x55559156f650) = 5829 [pid 5829] <... set_robust_list resumed>) = 0 [pid 5829] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5829] setpgid(0, 0) = 0 [pid 5829] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5829] write(3, "1000", 4) = 4 [pid 5829] close(3) = 0 [pid 5829] write(1, "executing program\n", 18executing program ) = 18 [pid 5829] memfd_create("syzkaller", 0) = 3 [pid 5829] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7feb01a00000 [pid 5829] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216 [pid 5829] munmap(0x7feb01a00000, 138412032) = 0 [pid 5829] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5829] ioctl(4, LOOP_SET_FD, 3) = 0 [pid 5829] close(3) = 0 [pid 5829] close(4) = 0 [pid 5829] mkdir("./file0", 0777) = 0 [ 102.617668][ T5829] loop0: detected capacity change from 0 to 32768 [ 102.698024][ T5829] bcachefs (loop0): starting version 1.7: mi_btree_bitmap opts=metadata_checksum=none,data_checksum=none,compression=lz4,erasure_code,degraded=yes,no_splitbrain_check,fsck,norecovery,nojournal_transaction_names,reconstruct_alloc,nocow [ 102.698055][ T5829] allowing incompatible features above 0.0: (unknown version) [ 102.698068][ T5829] features: lz4,new_siphash,inline_data,new_extent_overwrite,btree_ptr_v2,new_varint,journal_no_flush,alloc_v2,extents_across_btree_nodes [ 102.744052][ T5829] bcachefs (loop0): Using encoding defined by superblock: utf8-12.1.0 [ 102.754796][ T5829] bcachefs (loop0): recovering from clean shutdown, journal seq 10 [ 102.763520][ T5829] bcachefs (loop0): Version upgrade required: [ 102.763520][ T5829] Version upgrade from 0.24: unwritten_extents to 1.7: mi_btree_bitmap incomplete [ 102.763520][ T5829] Doing incompatible version upgrade from 0.24: unwritten_extents to 1.28: inode_has_case_insensitive [ 102.763520][ T5829] running recovery passes: check_allocations,check_alloc_info,check_lrus,check_btree_backpointers,check_backpointers_to_extents,check_extents_to_backpointers,check_alloc_to_lru_refs,bucket_gens_init,check_snapshot_trees,check_snapshots,check_subvols,check_subvol_children,delete_dead_snapshots,check_inodes,check_extents,check_indirect_extents,check_dirents,check_xattrs,check_root,check_unreachable_inodes,check_subvolume_structure,check_directory_structure,check_nlinks,check_rebalance_work,set_fs_needs_rebalance [ 102.837482][ T5829] bcachefs (loop0): dropping and reconstructing all alloc info [pid 5829] mount("/dev/loop0", "./file0", "bcachefs", MS_POSIXACL, "fsck,inline_data,nocow,degraded,str_hash=siphash,norecovery,discard,reconstruct_alloc,erasure_code,a"...) = 0 [pid 5829] openat(AT_FDCWD, "./file0", O_RDONLY|O_DIRECTORY) = 3 [pid 5829] chdir("./file0") = 0 [ 102.861938][ T5829] bcachefs (loop0): accounting_read... done [ 102.869018][ T5829] bcachefs (loop0): alloc_read... done [ 102.874905][ T5829] bcachefs (loop0): snapshots_read... done [ 102.882221][ T5829] bcachefs (loop0): done starting filesystem [pid 5829] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5829] ioctl(4, LOOP_CLR_FD) = 0 [pid 5829] close(4) = 0 [pid 5829] openat(AT_FDCWD, "./file0/file0", O_RDONLY|O_NOCTTY|O_SYNC) = 4 [pid 5829] ioctl(4, _IOC(_IOC_WRITE, 0xbc, 0xa, 0x70), 0x200000000340) = 5 [ 102.973199][ T5834] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 102.981172][ T5834] #PF: supervisor instruction fetch in kernel mode [ 102.987684][ T5834] #PF: error_code(0x0010) - not-present page [ 102.993671][ T5834] PGD 0 P4D 0 [ 102.997073][ T5834] Oops: Oops: 0010 [#1] SMP KASAN PTI [ 103.002491][ T5834] CPU: 0 UID: 0 PID: 5834 Comm: syz-executor375 Not tainted 6.16.0-rc1-syzkaller-00157-g02adc1490e6d #0 PREEMPT(full) [ 103.014931][ T5834] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 [ 103.025002][ T5834] RIP: 0010:0x0 [ 103.028492][ T5834] Code: Unable to access opcode bytes at 0xffffffffffffffd6. [ 103.035868][ T5834] RSP: 0018:ffffc900041b6d98 EFLAGS: 00010246 [ 103.041952][ T5834] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff888072e03ef0 [ 103.050027][ T5834] RDX: 1ffff1100e5c07de RSI: 0000000000000000 RDI: 0000000000092800 [ 103.058098][ T5834] RBP: ffffc900041b6ef0 R08: ffffc900041b6e67 R09: 0000000000000000 [ 103.066087][ T5834] R10: ffffc900041b6e40 R11: 0000000000000000 R12: 1ffff92000836dc4 [ 103.074068][ T5834] R13: ffff888072e03ef0 R14: 0000000000092c40 R15: 0000000000092800 [ 103.082049][ T5834] FS: 0000000000000000(0000) GS:ffff888125c84000(0000) knlGS:0000000000000000 [ 103.090991][ T5834] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 103.097618][ T5834] CR2: ffffffffffffffd6 CR3: 00000000339f4000 CR4: 00000000003526f0 [ 103.105603][ T5834] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 103.113640][ T5834] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 103.121667][ T5834] Call Trace: [ 103.124976][ T5834] [ 103.127916][ T5834] mempool_alloc_noprof+0x1a4/0x510 [ 103.133150][ T5834] ? __pfx_mempool_alloc_noprof+0x10/0x10 [ 103.138894][ T5834] ? bch2_btree_update_start+0x542/0x1dc0 [ 103.144650][ T5834] ? __pfx_down_read_trylock+0x10/0x10 [ 103.150143][ T5834] bch2_btree_update_start+0x572/0x1dc0 [ 103.155805][ T5834] ? bch2_btree_path_traverse_one+0x91e/0x21d0 [ 103.161988][ T5834] ? __pfx_bch2_btree_update_start+0x10/0x10 [ 103.167983][ T5834] ? __bch2_btree_path_set_pos+0xe0c/0x1530 [ 103.173913][ T5834] ? __pfx___bch2_btree_path_set_pos+0x10/0x10 [ 103.180087][ T5834] ? bch2_btree_iter_peek_node+0x566/0xbe0 [ 103.185907][ T5834] ? bch2_btree_iter_verify+0x1d/0x360 [ 103.191387][ T5834] bch2_btree_node_rewrite+0x17e/0x1120 [ 103.196953][ T5834] ? rewrite_old_nodes_pred+0x408/0x550 [ 103.202521][ T5834] ? bch2_move_btree+0x6a8/0xc60 [ 103.207478][ T5834] bch2_move_btree+0x6f0/0xc60 [ 103.212295][ T5834] ? __pfx_rewrite_old_nodes_pred+0x10/0x10 [ 103.218202][ T5834] ? __pfx_bch2_move_btree+0x10/0x10 [ 103.223504][ T5834] ? bch2_move_btree+0x23f/0xc60 [ 103.228483][ T5834] ? format_decode+0x5ee/0xe30 [ 103.233273][ T5834] ? string+0x279/0x2b0 [ 103.237498][ T5834] ? widen_string+0x3b/0x2a0 [ 103.242109][ T5834] ? bch2_move_btree+0x44e/0xc60 [ 103.247080][ T5834] ? scnprintf+0x109/0x170 [ 103.251532][ T5834] bch2_scan_old_btree_nodes+0x95/0x240 [ 103.257106][ T5834] bch2_data_job+0x646/0x910 [ 103.261714][ T5834] ? rcu_read_lock_sched_held+0x89/0x100 [ 103.267397][ T5834] ? __pfx_bch2_data_job+0x10/0x10 [ 103.272527][ T5834] ? xfd_validate_state+0x6d/0x150 [ 103.277659][ T5834] ? save_fpregs_to_fpstate+0xa3/0x210 [ 103.283133][ T5834] ? rcu_is_watching+0x15/0xb0 [ 103.287917][ T5834] ? __switch_to+0xd74/0x1600 [ 103.292611][ T5834] ? __lock_acquire+0xab9/0xd20 [ 103.297486][ T5834] ? finish_task_switch+0x18b/0x950 [ 103.302727][ T5834] ? finish_task_switch+0x266/0x950 [ 103.307969][ T5834] ? lockdep_hardirqs_on+0x9c/0x150 [ 103.313209][ T5834] ? rcu_is_watching+0x15/0xb0 [ 103.318018][ T5834] ? trace_sched_exit_tp+0x38/0x120 [ 103.323244][ T5834] ? __lock_acquire+0xab9/0xd20 [ 103.328120][ T5834] ? do_raw_spin_lock+0x121/0x290 [ 103.333166][ T5834] ? _raw_spin_unlock_irqrestore+0x85/0x110 [ 103.339092][ T5834] ? lockdep_hardirqs_on+0x9c/0x150 [ 103.344320][ T5834] ? _raw_spin_unlock_irqrestore+0xad/0x110 [ 103.350247][ T5834] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10 [ 103.356599][ T5834] bch2_data_thread+0x8f/0x1d0 [ 103.361385][ T5834] kthread+0x70e/0x8a0 [ 103.365474][ T5834] ? __pfx_bch2_data_thread+0x10/0x10 [ 103.370861][ T5834] ? __pfx_kthread+0x10/0x10 [ 103.375467][ T5834] ? _raw_spin_unlock_irq+0x23/0x50 [ 103.380690][ T5834] ? lockdep_hardirqs_on+0x9c/0x150 [ 103.385936][ T5834] ? __pfx_kthread+0x10/0x10 [ 103.390562][ T5834] ret_from_fork+0x3fc/0x770 [ 103.395191][ T5834] ? __pfx_ret_from_fork+0x10/0x10 [ 103.400333][ T5834] ? __switch_to_asm+0x39/0x70 [ 103.405113][ T5834] ? __switch_to_asm+0x33/0x70 [ 103.409889][ T5834] ? __pfx_kthread+0x10/0x10 [ 103.414589][ T5834] ret_from_fork_asm+0x1a/0x30 [ 103.419377][ T5834] [ 103.422408][ T5834] Modules linked in: [ 103.426341][ T5834] CR2: 0000000000000000 [ 103.430505][ T5834] ---[ end trace 0000000000000000 ]--- [ 103.435999][ T5834] RIP: 0010:0x0 [ 103.439480][ T5834] Code: Unable to access opcode bytes at 0xffffffffffffffd6. [ 103.446852][ T5834] RSP: 0018:ffffc900041b6d98 EFLAGS: 00010246 [ 103.452933][ T5834] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff888072e03ef0 [ 103.460916][ T5834] RDX: 1ffff1100e5c07de RSI: 0000000000000000 RDI: 0000000000092800 [ 103.468906][ T5834] RBP: ffffc900041b6ef0 R08: ffffc900041b6e67 R09: 0000000000000000 [ 103.476893][ T5834] R10: ffffc900041b6e40 R11: 0000000000000000 R12: 1ffff92000836dc4 [ 103.484875][ T5834] R13: ffff888072e03ef0 R14: 0000000000092c40 R15: 0000000000092800 [ 103.492858][ T5834] FS: 0000000000000000(0000) GS:ffff888125c84000(0000) knlGS:0000000000000000 [ 103.501798][ T5834] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 103.508429][ T5834] CR2: ffffffffffffffd6 CR3: 00000000339f4000 CR4: 00000000003526f0 [ 103.516421][ T5834] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 103.524507][ T5834] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 103.532491][ T5834] Kernel panic - not syncing: Fatal exception [ 103.538865][ T5834] Kernel Offset: disabled [ 103.543203][ T5834] Rebooting in 86400 seconds..