bisecting cause commit starting from dc4c899977350728714d44b6e0d39673f6a97281 building syzkaller on c198d5ddeb35c810b03f6e7042bc64b5f7a8726c testing commit dc4c899977350728714d44b6e0d39673f6a97281 with gcc (GCC) 8.1.0 run #0: crashed: general protection fault in skb_put run #1: crashed: general protection fault in skb_put run #2: crashed: general protection fault in skb_put run #3: OK run #4: OK run #5: crashed: general protection fault in skb_put run #6: OK run #7: OK testing release v4.20 testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0 run #0: crashed: general protection fault in skb_put run #1: crashed: general protection fault in skb_put run #2: crashed: general protection fault in skb_put run #3: crashed: general protection fault in skb_put run #4: crashed: general protection fault in skb_put run #5: crashed: general protection fault in skb_put run #6: OK run #7: OK testing release v4.19 testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0 all runs: OK # git bisect start v4.20 v4.19 Bisecting: 7499 revisions left to test after this (roughly 13 steps) [ec9c166434595382be3babf266febf876327774d] Merge tag 'mips_fixes_4.20_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux testing commit ec9c166434595382be3babf266febf876327774d with gcc (GCC) 8.1.0 run #0: crashed: general protection fault in skb_put run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK # git bisect bad ec9c166434595382be3babf266febf876327774d Bisecting: 3252 revisions left to test after this (roughly 12 steps) [50b825d7e87f4cff7070df6eb26390152bb29537] Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next testing commit 50b825d7e87f4cff7070df6eb26390152bb29537 with gcc (GCC) 8.1.0 run #0: crashed: general protection fault in skb_put run #1: crashed: general protection fault in corrupted run #2: crashed: general protection fault in skb_put run #3: crashed: general protection fault in skb_put run #4: OK run #5: OK run #6: OK run #7: OK # git bisect bad 50b825d7e87f4cff7070df6eb26390152bb29537 Bisecting: 2120 revisions left to test after this (roughly 11 steps) [99e9acd85ccbdc8f5785f9e961d4956e96bd6aa5] Merge tag 'mlx5-updates-2018-10-17' of git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux testing commit 99e9acd85ccbdc8f5785f9e961d4956e96bd6aa5 with gcc (GCC) 8.1.0 all runs: OK # git bisect good 99e9acd85ccbdc8f5785f9e961d4956e96bd6aa5 Bisecting: 1061 revisions left to test after this (roughly 10 steps) [c403993a41d50db1e7d9bc2d43c3c8498162312f] Merge tag 'for-linus-4.20' of https://github.com/cminyard/linux-ipmi testing commit c403993a41d50db1e7d9bc2d43c3c8498162312f with gcc (GCC) 8.1.0 run #0: crashed: general protection fault in skb_put run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK # git bisect bad c403993a41d50db1e7d9bc2d43c3c8498162312f Bisecting: 574 revisions left to test after this (roughly 9 steps) [6214a9fe2aeca5e22184b20954774424e2efc1f6] Merge tag 'regmap-v5.0' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap testing commit 6214a9fe2aeca5e22184b20954774424e2efc1f6 with gcc (GCC) 8.1.0 run #0: crashed: general protection fault in skb_put run #1: crashed: general protection fault in skb_put run #2: crashed: general protection fault in skb_put run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK # git bisect bad 6214a9fe2aeca5e22184b20954774424e2efc1f6 Bisecting: 276 revisions left to test after this (roughly 8 steps) [52990a5fb0c991ecafebdab43138b5ed41376852] block: setup bounce bio_sets properly testing commit 52990a5fb0c991ecafebdab43138b5ed41376852 with gcc (GCC) 8.1.0 run #0: crashed: general protection fault in skb_put run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK # git bisect bad 52990a5fb0c991ecafebdab43138b5ed41376852 Bisecting: 103 revisions left to test after this (roughly 7 steps) [ae14cc044b5988148d819c377fd0cc1c7504bc3c] lightnvm: pblk: refactor put line fn on read completion testing commit ae14cc044b5988148d819c377fd0cc1c7504bc3c with gcc (GCC) 8.1.0 run #0: crashed: general protection fault in skb_put run #1: crashed: general protection fault in skb_put run #2: crashed: general protection fault in skb_put run #3: crashed: general protection fault in skb_put run #4: crashed: general protection fault in skb_put run #5: crashed: general protection fault in skb_put run #6: OK run #7: OK # git bisect bad ae14cc044b5988148d819c377fd0cc1c7504bc3c Bisecting: 51 revisions left to test after this (roughly 6 steps) [fef912bf860e8e7e48a2bfb978a356bba743a8b7] block: genhd: add 'groups' argument to device_add_disk testing commit fef912bf860e8e7e48a2bfb978a356bba743a8b7 with gcc (GCC) 8.1.0 all runs: OK # git bisect good fef912bf860e8e7e48a2bfb978a356bba743a8b7 Bisecting: 25 revisions left to test after this (roughly 5 steps) [6d8623a71135d8e2d397c1534f35e04dcf867749] blk-mq-debugfs: Also show requests that have not yet been started testing commit 6d8623a71135d8e2d397c1534f35e04dcf867749 with gcc (GCC) 8.1.0 run #0: crashed: general protection fault in skb_put run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK # git bisect bad 6d8623a71135d8e2d397c1534f35e04dcf867749 Bisecting: 12 revisions left to test after this (roughly 4 steps) [d93cb3927ca5528bd21f2635a2300f9a1426ac46] nvmet: remove redundant module prefix testing commit d93cb3927ca5528bd21f2635a2300f9a1426ac46 with gcc (GCC) 8.1.0 all runs: OK # git bisect good d93cb3927ca5528bd21f2635a2300f9a1426ac46 Bisecting: 6 revisions left to test after this (roughly 3 steps) [73383adfad245bb84e6d6ef7830f01048fcfc217] nvmet: don't split large I/Os unconditionally testing commit 73383adfad245bb84e6d6ef7830f01048fcfc217 with gcc (GCC) 8.1.0 run #0: crashed: general protection fault in corrupted run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK # git bisect bad 73383adfad245bb84e6d6ef7830f01048fcfc217 Bisecting: 2 revisions left to test after this (roughly 2 steps) [97faec531460c949d7120672b8c77e2f41f8d6d7] nvme_fc: add 'nvme_discovery' sysfs attribute to fc transport device testing commit 97faec531460c949d7120672b8c77e2f41f8d6d7 with gcc (GCC) 8.1.0 run #0: crashed: general protection fault in skb_put run #1: crashed: general protection fault in corrupted run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK # git bisect bad 97faec531460c949d7120672b8c77e2f41f8d6d7 Bisecting: 0 revisions left to test after this (roughly 1 step) [ea96d6496ff59b2b26dc9e13dc8f57d77731eb37] nvmet_fc: support target port removal with nvmet layer testing commit ea96d6496ff59b2b26dc9e13dc8f57d77731eb37 with gcc (GCC) 8.1.0 all runs: OK # git bisect good ea96d6496ff59b2b26dc9e13dc8f57d77731eb37 97faec531460c949d7120672b8c77e2f41f8d6d7 is the first bad commit commit 97faec531460c949d7120672b8c77e2f41f8d6d7 Author: James Smart Date: Thu Sep 13 16:17:38 2018 -0700 nvme_fc: add 'nvme_discovery' sysfs attribute to fc transport device The fc transport device should allow for a rediscovery, as userspace might have lost the events. Example is udev events not handled during system startup. This patch add a sysfs entry 'nvme_discovery' on the fc class to have it replay all udev discovery events for all local port/remote port address pairs. Signed-off-by: James Smart Signed-off-by: Christoph Hellwig :040000 040000 aba853b43516f08a424335d69eda61a715040c51 d38ab11268027c0bb75230b3a6b9e671740cfae7 M drivers revisions tested: 16, total time: 4h27m43.244011643s (build: 1h29m45.101260495s, test: 2h53m47.836907581s) first bad commit: 97faec531460c949d7120672b8c77e2f41f8d6d7 nvme_fc: add 'nvme_discovery' sysfs attribute to fc transport device cc: ["axboe@fb.com" "hch@lst.de" "james.smart@broadcom.com" "jsmart2021@gmail.com" "keith.busch@intel.com" "linux-kernel@vger.kernel.org" "linux-nvme@lists.infradead.org" "sagi@grimberg.me"] crash: general protection fault in corrupted RBP: 00007f07dfd13ca0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f07dfd146d4 R13: 00000000004a92a7 R14: 00000000006e7918 R15: 0000000000000004 kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN Bluetooth: Can't allocate mem for new packet CPU: 0 PID: 257 Comm: kworker/u5:2 Not tainted 4.19.0-rc6+ #1 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014 Workqueue: events_unbound flush_to_ldisc RIP: 0010:skb_put+0x34/0x1e0 net/core/skbuff.c:1693 Code: 56 41 55 41 54 53 48 89 fb 4c 8d ab c8 00 00 00 48 83 ec 08 e8 8d ae 0b fc 4c 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 14 02 4c 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 52 RSP: 0018:ffff88002ceafb70 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff84e10f5d RDX: 0000000000000019 RSI: ffffffff855f72f3 RDI: 0000000000000000 RBP: ffff88002ceafba0 R08: ffff88002cea6000 R09: ffffed0005b04732 R10: ffffed0005b04732 R11: ffff88002d823993 R12: 000000000000005e R13: 00000000000000c8 R14: 000000000000000a R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff88002d800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd7ac7ccdc CR3: 000000007bd3b000 CR4: 00000000007406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: skb_put_data include/linux/skbuff.h:2064 [inline] bcsp_unslip_one_byte drivers/bluetooth/hci_bcsp.c:451 [inline] bcsp_recv+0x9ae/0x1410 drivers/bluetooth/hci_bcsp.c:612 hci_uart_tty_receive+0x232/0x540 drivers/bluetooth/hci_ldisc.c:607 CPU: 1 PID: 7602 Comm: syz-executor0 Not tainted 4.19.0-rc6+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x162/0x1e4 lib/dump_stack.c:113 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold.4+0xa/0x17 lib/fault-inject.c:149 __should_failslab+0x124/0x180 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1557 slab_pre_alloc_hook mm/slab.h:423 [inline] slab_alloc_node mm/slab.c:3299 [inline] kmem_cache_alloc_node+0x56/0x730 mm/slab.c:3642 __alloc_skb+0xd6/0x610 net/core/skbuff.c:193 alloc_skb include/linux/skbuff.h:995 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:339 [inline] bcsp_recv+0x8e1/0x1410 drivers/bluetooth/hci_bcsp.c:685 hci_uart_tty_receive+0x232/0x540 drivers/bluetooth/hci_ldisc.c:607 tiocsti drivers/tty/tty_io.c:2176 [inline] tty_ioctl+0x6dc/0x1710 drivers/tty/tty_io.c:2562 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x1e1/0x1300 fs/ioctl.c:685 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702 __do_sys_ioctl fs/ioctl.c:709 [inline] __se_sys_ioctl fs/ioctl.c:707 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707 do_syscall_64+0x103/0x600 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457649 Code: 8d b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fe4d1989c88 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000071bf00 RCX: 0000000000457649 RDX: 0000000020000040 RSI: 0000000000005412 RDI: 0000000000000003 RBP: 00007fe4d1989ca0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe4d198a6d4 R13: 00000000004a92a7 R14: 00000000006e7918 R15: 0000000000000004 Bluetooth: Can't allocate mem for new packet tty_ldisc_receive_buf+0x152/0x190 drivers/tty/tty_buffer.c:460 tty_port_default_receive_buf+0x7b/0xb0 drivers/tty/tty_port.c:38 receive_buf drivers/tty/tty_buffer.c:475 [inline] flush_to_ldisc+0x24c/0x360 drivers/tty/tty_buffer.c:524 process_one_work+0x994/0x16c0 kernel/workqueue.c:2153 worker_thread+0x8b/0xd20 kernel/workqueue.c:2296 kthread+0x35a/0x420 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413 Modules linked in: ---[ end trace 9ef400ac1fa8cc4a ]--- RIP: 0010:skb_put+0x34/0x1e0 net/core/skbuff.c:1693 Code: 56 41 55 41 54 53 48 89 fb 4c 8d ab c8 00 00 00 48 83 ec 08 e8 8d ae 0b fc 4c 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 14 02 4c 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 52 RSP: 0018:ffff88002ceafb70 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff84e10f5d RDX: 0000000000000019 RSI: ffffffff855f72f3 RDI: 0000000000000000 RBP: ffff88002ceafba0 R08: ffff88002cea6000 R09: ffffed0005b04732 R10: ffffed0005b04732 R11: ffff88002d823993 R12: 000000000000005e R13: 00000000000000c8 R14: 000000000000000a R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff88002d800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8cd7484190 CR3: 00000000783ed000 CR4: 00000000007406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554