./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor4008930126 <...> Warning: Permanently added '10.128.1.8' (ED25519) to the list of known hosts. execve("./syz-executor4008930126", ["./syz-executor4008930126"], 0x7ffd7259bc50 /* 10 vars */) = 0 brk(NULL) = 0x55558b4aa000 brk(0x55558b4aad00) = 0x55558b4aad00 arch_prctl(ARCH_SET_FS, 0x55558b4aa380) = 0 set_tid_address(0x55558b4aa650) = 5825 set_robust_list(0x55558b4aa660, 24) = 0 rseq(0x55558b4aaca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor4008930126", 4096) = 28 getrandom("\x87\x62\xf2\x0a\x1a\x22\x74\xb7", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55558b4aad00 brk(0x55558b4cbd00) = 0x55558b4cbd00 brk(0x55558b4cc000) = 0x55558b4cc000 mprotect(0x7f476bf0e000, 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 5827 attached [pid 5827] set_robust_list(0x55558b4aa660, 24) = 0 [pid 5825] <... clone resumed>, child_tidptr=0x55558b4aa650) = 5827 [pid 5827] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5827] setpgid(0, 0) = 0 [pid 5827] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5827] write(3, "1000", 4) = 4 [pid 5827] close(3) = 0 [pid 5827] write(1, "executing program\n", 18executing program ) = 18 [pid 5827] memfd_create("syzkaller", 0) = 3 [pid 5827] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f4763a00000 [pid 5827] 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 5827] munmap(0x7f4763a00000, 138412032) = 0 [pid 5827] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5827] ioctl(4, LOOP_SET_FD, 3) = 0 [pid 5827] close(3) = 0 [pid 5827] close(4) = 0 [pid 5827] mkdir("./file0", 0777) = 0 [ 86.673762][ T5827] loop0: detected capacity change from 0 to 32768 [ 86.790200][ T5827] 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 [ 86.790230][ T5827] allowing incompatible features above 0.0: (unknown version) [ 86.790243][ T5827] features: lz4,new_siphash,inline_data,new_extent_overwrite,btree_ptr_v2,new_varint,journal_no_flush,alloc_v2,extents_across_btree_nodes [ 86.868270][ T5827] bcachefs (loop0): Using encoding defined by superblock: utf8-12.1.0 [ 86.876766][ T5827] bcachefs (loop0): recovering from clean shutdown, journal seq 10 [ 86.885038][ T5827] bcachefs (loop0): Version upgrade required: [ 86.885038][ T5827] Version upgrade from 0.24: unwritten_extents to 1.7: mi_btree_bitmap incomplete [ 86.885038][ T5827] Doing incompatible version upgrade from 0.24: unwritten_extents to 1.28: inode_has_case_insensitive [ 86.885038][ T5827] 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 [ 86.959058][ T5827] bcachefs (loop0): dropping and reconstructing all alloc info [ 86.981999][ T5827] bcachefs (loop0): accounting_read... done [pid 5827] mount("/dev/loop0", "./file0", "bcachefs", MS_POSIXACL, "fsck,inline_data,nocow,degraded,str_hash=siphash,norecovery,discard,reconstruct_alloc,erasure_code,a"...) = 0 [pid 5827] openat(AT_FDCWD, "./file0", O_RDONLY|O_DIRECTORY) = 3 [pid 5827] chdir("./file0") = 0 [pid 5827] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [ 86.989013][ T5827] bcachefs (loop0): alloc_read... done [ 86.994903][ T5827] bcachefs (loop0): snapshots_read... done [ 87.002055][ T5827] bcachefs (loop0): done starting filesystem [pid 5827] ioctl(4, LOOP_CLR_FD) = 0 [pid 5827] close(4) = 0 [pid 5827] openat(AT_FDCWD, "./file0/file0", O_RDONLY|O_NOCTTY|O_SYNC) = 4 [pid 5827] ioctl(4, _IOC(_IOC_WRITE, 0xbc, 0xa, 0x70), 0x200000000340) = 5 [ 87.084282][ T5831] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 87.092141][ T5831] #PF: supervisor instruction fetch in kernel mode [ 87.098658][ T5831] #PF: error_code(0x0010) - not-present page [ 87.104651][ T5831] PGD 0 P4D 0 [ 87.108063][ T5831] Oops: Oops: 0010 [#1] SMP KASAN PTI [ 87.113485][ T5831] CPU: 0 UID: 0 PID: 5831 Comm: syz-executor400 Not tainted 6.16.0-rc1-syzkaller-00157-g02adc1490e6d #0 PREEMPT(full) [ 87.125925][ T5831] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 [ 87.136002][ T5831] RIP: 0010:0x0 [ 87.139474][ T5831] Code: Unable to access opcode bytes at 0xffffffffffffffd6. [ 87.146851][ T5831] RSP: 0018:ffffc9000422ed98 EFLAGS: 00010246 [ 87.152935][ T5831] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff888072b03ef0 [ 87.160916][ T5831] RDX: 1ffff1100e5607de RSI: 0000000000000000 RDI: 0000000000092800 [ 87.168895][ T5831] RBP: ffffc9000422eef0 R08: ffffc9000422ee67 R09: 0000000000000000 [ 87.176878][ T5831] R10: ffffc9000422ee40 R11: 0000000000000000 R12: 1ffff92000845dc4 [ 87.184888][ T5831] R13: ffff888072b03ef0 R14: 0000000000092c40 R15: 0000000000092800 [ 87.192878][ T5831] FS: 0000000000000000(0000) GS:ffff888125c84000(0000) knlGS:0000000000000000 [ 87.201831][ T5831] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 87.208431][ T5831] CR2: ffffffffffffffd6 CR3: 00000000728ce000 CR4: 00000000003526f0 [ 87.216435][ T5831] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 87.224427][ T5831] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 87.232415][ T5831] Call Trace: [ 87.235720][ T5831] [ 87.238668][ T5831] mempool_alloc_noprof+0x1a4/0x510 [ 87.243909][ T5831] ? __pfx_mempool_alloc_noprof+0x10/0x10 [ 87.249648][ T5831] ? bch2_btree_update_start+0x542/0x1dc0 [ 87.255386][ T5831] ? __pfx_down_read_trylock+0x10/0x10 [ 87.260859][ T5831] bch2_btree_update_start+0x572/0x1dc0 [ 87.266415][ T5831] ? bch2_btree_path_traverse_one+0x91e/0x21d0 [ 87.272587][ T5831] ? __pfx_bch2_btree_update_start+0x10/0x10 [ 87.278575][ T5831] ? __bch2_btree_path_set_pos+0xe0c/0x1530 [ 87.284487][ T5831] ? __pfx___bch2_btree_path_set_pos+0x10/0x10 [ 87.290674][ T5831] ? bch2_btree_iter_peek_node+0x566/0xbe0 [ 87.296513][ T5831] ? bch2_btree_iter_verify+0x1d/0x360 [ 87.301998][ T5831] bch2_btree_node_rewrite+0x17e/0x1120 [ 87.307563][ T5831] ? rewrite_old_nodes_pred+0x408/0x550 [ 87.313139][ T5831] ? bch2_move_btree+0x6a8/0xc60 [ 87.318089][ T5831] bch2_move_btree+0x6f0/0xc60 [ 87.322888][ T5831] ? __pfx_rewrite_old_nodes_pred+0x10/0x10 [ 87.328806][ T5831] ? __pfx_bch2_move_btree+0x10/0x10 [ 87.334117][ T5831] ? bch2_move_btree+0x23f/0xc60 [ 87.339078][ T5831] ? format_decode+0x5ee/0xe30 [ 87.343871][ T5831] ? string+0x279/0x2b0 [ 87.348037][ T5831] ? widen_string+0x3b/0x2a0 [ 87.352645][ T5831] ? bch2_move_btree+0x44e/0xc60 [ 87.357597][ T5831] ? scnprintf+0x109/0x170 [ 87.362030][ T5831] bch2_scan_old_btree_nodes+0x95/0x240 [ 87.367594][ T5831] bch2_data_job+0x646/0x910 [ 87.372289][ T5831] ? rcu_read_lock_sched_held+0x89/0x100 [ 87.377939][ T5831] ? __pfx_bch2_data_job+0x10/0x10 [ 87.383070][ T5831] ? kvm_sched_clock_read+0x11/0x20 [ 87.388286][ T5831] ? sched_clock+0x3f/0x60 [ 87.392712][ T5831] ? sched_clock_cpu+0x74/0x430 [ 87.397581][ T5831] ? psi_task_switch+0x39e/0x6d0 [ 87.402552][ T5831] ? __switch_to+0xd74/0x1600 [ 87.407266][ T5831] ? __lock_acquire+0xab9/0xd20 [ 87.412176][ T5831] ? finish_task_switch+0x18b/0x950 [ 87.417400][ T5831] ? finish_task_switch+0x266/0x950 [ 87.422618][ T5831] ? lockdep_hardirqs_on+0x9c/0x150 [ 87.427845][ T5831] ? rcu_is_watching+0x15/0xb0 [ 87.432637][ T5831] ? trace_sched_exit_tp+0x38/0x120 [ 87.437877][ T5831] ? __lock_acquire+0xab9/0xd20 [ 87.442745][ T5831] ? do_raw_spin_lock+0x121/0x290 [ 87.447786][ T5831] ? _raw_spin_unlock_irqrestore+0x85/0x110 [ 87.453706][ T5831] ? lockdep_hardirqs_on+0x9c/0x150 [ 87.458919][ T5831] ? _raw_spin_unlock_irqrestore+0xad/0x110 [ 87.464916][ T5831] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10 [ 87.471288][ T5831] bch2_data_thread+0x8f/0x1d0 [ 87.476087][ T5831] kthread+0x70e/0x8a0 [ 87.480177][ T5831] ? __pfx_bch2_data_thread+0x10/0x10 [ 87.485571][ T5831] ? __pfx_kthread+0x10/0x10 [ 87.490178][ T5831] ? _raw_spin_unlock_irq+0x23/0x50 [ 87.495397][ T5831] ? lockdep_hardirqs_on+0x9c/0x150 [ 87.500623][ T5831] ? __pfx_kthread+0x10/0x10 [ 87.505226][ T5831] ret_from_fork+0x3fc/0x770 [ 87.509835][ T5831] ? __pfx_ret_from_fork+0x10/0x10 [ 87.514961][ T5831] ? __switch_to_asm+0x39/0x70 [ 87.519733][ T5831] ? __switch_to_asm+0x33/0x70 [ 87.524509][ T5831] ? __pfx_kthread+0x10/0x10 [ 87.529110][ T5831] ret_from_fork_asm+0x1a/0x30 [ 87.533891][ T5831] [ 87.536917][ T5831] Modules linked in: [ 87.540853][ T5831] CR2: 0000000000000000 [ 87.545016][ T5831] ---[ end trace 0000000000000000 ]--- [ 87.550486][ T5831] RIP: 0010:0x0 [ 87.553962][ T5831] Code: Unable to access opcode bytes at 0xffffffffffffffd6. [ 87.561329][ T5831] RSP: 0018:ffffc9000422ed98 EFLAGS: 00010246 [ 87.567408][ T5831] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff888072b03ef0 [ 87.575392][ T5831] RDX: 1ffff1100e5607de RSI: 0000000000000000 RDI: 0000000000092800 [ 87.583381][ T5831] RBP: ffffc9000422eef0 R08: ffffc9000422ee67 R09: 0000000000000000 [ 87.591365][ T5831] R10: ffffc9000422ee40 R11: 0000000000000000 R12: 1ffff92000845dc4 [ 87.599352][ T5831] R13: ffff888072b03ef0 R14: 0000000000092c40 R15: 0000000000092800 [ 87.607339][ T5831] FS: 0000000000000000(0000) GS:ffff888125c84000(0000) knlGS:0000000000000000 [ 87.616279][ T5831] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 87.622872][ T5831] CR2: ffffffffffffffd6 CR3: 00000000728ce000 CR4: 00000000003526f0 [ 87.630854][ T5831] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 87.638827][ T5831] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 87.646805][ T5831] Kernel panic - not syncing: Fatal exception [ 87.653228][ T5831] Kernel Offset: disabled [ 87.657649][ T5831] Rebooting in 86400 seconds..